Add project files.

MyNotes.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31611.283
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MyNotes", "MyNotes\MyNotes.csproj", "{121DCE34-28FB-4E6E-85D1-729800EB1E0C}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{121DCE34-28FB-4E6E-85D1-729800EB1E0C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{121DCE34-28FB-4E6E-85D1-729800EB1E0C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{121DCE34-28FB-4E6E-85D1-729800EB1E0C}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
+		{121DCE34-28FB-4E6E-85D1-729800EB1E0C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{121DCE34-28FB-4E6E-85D1-729800EB1E0C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{121DCE34-28FB-4E6E-85D1-729800EB1E0C}.Release|Any CPU.Deploy.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {61F7FB11-1E47-470C-91E2-47F8143E1572}
+	EndGlobalSection
+EndGlobal

MyNotes/App.xaml

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+<?xml version = "1.0" encoding = "UTF-8" ?>
+<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:local="clr-namespace:MyNotes"
+             x:Class="MyNotes.App">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="Resources/Styles/Colors.xaml" />
+                <ResourceDictionary Source="Resources/Styles/Styles.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

MyNotes/App.xaml.cs

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+using MyNotes.Views;
+
+namespace MyNotes;
+
+public partial class App : Application
+{
+	public App()
+	{
+		InitializeComponent();
+
+		MainPage = new AppShell();
+	}
+}

MyNotes/AppShell.xaml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<Shell x:Class="MyNotes.AppShell"
+       xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+       xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+       xmlns:views="clr-namespace:MyNotes.Views"
+       Shell.FlyoutBehavior="Disabled">
+
+    <TabBar>
+        <ShellContent Title="Notes"
+                      ContentTemplate="{DataTemplate views:NotePage}"
+                      Icon="icon_notes"/>
+        <ShellContent Title="About"
+                      ContentTemplate="{DataTemplate views:AboutPage}"
+                      Icon="icon_about"/>
+    </TabBar>    
+
+</Shell>

MyNotes/AppShell.xaml.cs

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+namespace MyNotes;
+
+public partial class AppShell : Shell
+{
+	public AppShell()
+	{
+		InitializeComponent();
+	}
+}

MyNotes/MauiProgram.cs

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+namespace MyNotes;
+
+public static class MauiProgram
+{
+	public static MauiApp CreateMauiApp()
+	{
+		var builder = MauiApp.CreateBuilder();
+		builder
+			.UseMauiApp<App>()
+			.ConfigureFonts(fonts =>
+			{
+				fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
+				fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
+			});
+
+		return builder.Build();
+	}
+}

MyNotes/Models/TxtFileStorage.cs

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+namespace MyNotes.Models
+{
+    public class TxtFileStorage
+    {
+        public string PathToStorage { get; }
+
+        public TxtFileStorage(string path)
+        {
+            if (path == null)
+                throw new ArgumentNullException(nameof(path), "Path to storage file can't be null.");
+
+            PathToStorage = path;
+        }
+
+        public void Save(string text)
+        {
+            File.WriteAllText(PathToStorage, text);
+        }
+
+        public string Load()
+        {
+            if (File.Exists(PathToStorage))
+                return File.ReadAllText(PathToStorage);
+            return null;
+        }
+    }
+}

MyNotes/MyNotes.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<TargetFrameworks>net6.0-android;net6.0-ios;net6.0-maccatalyst</TargetFrameworks>
+		<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net6.0-windows10.0.19041.0</TargetFrameworks>
+		<!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
+		<!-- <TargetFrameworks>$(TargetFrameworks);net6.0-tizen</TargetFrameworks> -->
+		<OutputType>Exe</OutputType>
+		<RootNamespace>MyNotes</RootNamespace>
+		<UseMaui>true</UseMaui>
+		<SingleProject>true</SingleProject>
+		<ImplicitUsings>enable</ImplicitUsings>
+
+		<!-- Display name -->
+		<ApplicationTitle>My Notes</ApplicationTitle>
+
+		<!-- App Identifier -->
+		<ApplicationId>com.fomgleb.mynotes</ApplicationId>
+		<ApplicationIdGuid>7e1cc55e-0792-4d19-8524-564972cf89ca</ApplicationIdGuid>
+
+		<!-- Versions -->
+		<ApplicationDisplayVersion>0.1.0</ApplicationDisplayVersion>
+		<ApplicationVersion>1</ApplicationVersion>
+
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">14.2</SupportedOSPlatformVersion>
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">14.0</SupportedOSPlatformVersion>
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">21.0</SupportedOSPlatformVersion>
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</SupportedOSPlatformVersion>
+		<TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</TargetPlatformMinVersion>
+		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
+		<AssemblyVersion>0.1.0.0</AssemblyVersion>
+		<FileVersion>0.1.0.0</FileVersion>
+	</PropertyGroup>
+
+	<!--<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net6.0-android|AnyCPU'">-->
+	<!--<PropertyGroup Condition="$(TargetFramework.Contains('-android')) and '$(Configuration)' == 'Release'">
+	  <ApplicationDisplayVersion>0.1.0</ApplicationDisplayVersion>
+	  <ApplicationVersion>1</ApplicationVersion>
+	  <ApplicationTitle>My Notes</ApplicationTitle>
+		<AndroidKeyStore>True</AndroidKeyStore>
+		<AndroidSingingKeyStore>myapp.keystore</AndroidSingingKeyStore>
+		<AndroidSigningKeyAlias>key</AndroidSigningKeyAlias>
+		<AndroidSigningKeyPass></AndroidSigningKeyPass>
+		<AndroidSigningStorePass></AndroidSigningStorePass>
+	</PropertyGroup>-->
+
+	<ItemGroup>
+		<!-- App Icon -->
+		<MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />
+
+		<!-- Splash Screen -->
+		<MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#512BD4" BaseSize="128,128" />
+
+		<!-- Images -->
+		<MauiImage Include="Resources\Images\*" />
+		<MauiImage Update="Resources\Images\dotnet_bot.svg" BaseSize="168,208" />
+
+		<!-- Custom Fonts -->
+		<MauiFont Include="Resources\Fonts\*" />
+
+		<!-- Raw Assets (also remove the "Resources\Raw" prefix) -->
+		<MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
+	</ItemGroup>
+
+	<!--<ItemGroup>
+	  <None Remove="Resources\Images\icon_about.png" />
+	  <None Remove="Resources\Images\icon_notes.png" />
+	</ItemGroup>
+
+	<ItemGroup>
+	  <MauiXaml Update="Views\AboutPage.xaml">
+	    <Generator>MSBuild:Compile</Generator>
+	  </MauiXaml>
+	  <MauiXaml Update="Views\NotePage.xaml">
+	    <Generator>MSBuild:Compile</Generator>
+	  </MauiXaml>
+	</ItemGroup>-->
+
+</Project>

MyNotes/Platforms/Android/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+	<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
+	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+	<uses-permission android:name="android.permission.INTERNET" />
+</manifest>

MyNotes/Platforms/Android/MainActivity.cs

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+using Android.App;
+using Android.Content.PM;
+using Android.OS;
+
+namespace MyNotes;
+
+[Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]
+public class MainActivity : MauiAppCompatActivity
+{
+}

MyNotes/Platforms/Android/MainApplication.cs

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+using Android.App;
+using Android.Runtime;
+
+namespace MyNotes;
+
+[Application]
+public class MainApplication : MauiApplication
+{
+	public MainApplication(IntPtr handle, JniHandleOwnership ownership)
+		: base(handle, ownership)
+	{
+	}
+
+	protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+}

MyNotes/Platforms/Android/Resources/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#512BD4</color>
+    <color name="colorPrimaryDark">#2B0B98</color>
+    <color name="colorAccent">#2B0B98</color>
+</resources>

MyNotes/Platforms/MacCatalyst/AppDelegate.cs

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+using Foundation;
+
+namespace MyNotes;
+
+[Register("AppDelegate")]
+public class AppDelegate : MauiUIApplicationDelegate
+{
+	protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+}

MyNotes/Platforms/MacCatalyst/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>UIDeviceFamily</key>
+	<array>
+		<integer>1</integer>
+		<integer>2</integer>
+	</array>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>arm64</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>XSAppIconAssets</key>
+	<string>Assets.xcassets/appicon.appiconset</string>
+</dict>
+</plist>

MyNotes/Platforms/MacCatalyst/Program.cs

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+using ObjCRuntime;
+using UIKit;
+
+namespace MyNotes;
+
+public class Program
+{
+	// This is the main entry point of the application.
+	static void Main(string[] args)
+	{
+		// if you want to use a different Application Delegate class from "AppDelegate"
+		// you can specify it here.
+		UIApplication.Main(args, null, typeof(AppDelegate));
+	}
+}

MyNotes/Platforms/Tizen/Main.cs

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+using System;
+using Microsoft.Maui;
+using Microsoft.Maui.Hosting;
+
+namespace MyNotes;
+
+class Program : MauiApplication
+{
+	protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+
+	static void Main(string[] args)
+	{
+		var app = new Program();
+		app.Run(args);
+	}
+}

MyNotes/Platforms/Tizen/tizen-manifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest package="maui-application-id-placeholder" version="0.0.0" api-version="7" xmlns="http://tizen.org/ns/packages">
+  <profile name="common" />
+  <ui-application appid="maui-application-id-placeholder" exec="MyNotes.dll" multiple="false" nodisplay="false" taskmanage="true" type="dotnet" launch_mode="single">
+    <label>maui-application-title-placeholder</label>
+    <icon>maui-appicon-placeholder</icon>
+    <metadata key="http://tizen.org/metadata/prefer_dotnet_aot" value="true" />
+  </ui-application>
+  <shortcut-list />
+  <privileges>
+    <privilege>http://tizen.org/privilege/internet</privilege>
+  </privileges> 
+  <dependencies />
+  <provides-appdefined-privileges />
+</manifest>

MyNotes/Platforms/Windows/App.xaml

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+<maui:MauiWinUIApplication
+    x:Class="MyNotes.WinUI.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:maui="using:Microsoft.Maui"
+    xmlns:local="using:MyNotes.WinUI">
+
+</maui:MauiWinUIApplication>

MyNotes/Platforms/Windows/App.xaml.cs

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+using Microsoft.UI.Xaml;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace MyNotes.WinUI;
+
+/// <summary>
+/// Provides application-specific behavior to supplement the default Application class.
+/// </summary>
+public partial class App : MauiWinUIApplication
+{
+	/// <summary>
+	/// Initializes the singleton application object.  This is the first line of authored code
+	/// executed, and as such is the logical equivalent of main() or WinMain().
+	/// </summary>
+	public App()
+	{
+		this.InitializeComponent();
+	}
+
+	protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+}
+