Revamp the connector

README.md

@@ -7,13 +7,161 @@ Ballerina Microsoft Excel Connector
 [![GraalVM Check](https://github.com/ballerina-platform/module-ballerinax-microsoft.excel/actions/workflows/build-with-bal-test-native.yml/badge.svg)](https://github.com/ballerina-platform/module-ballerinax-microsoft.excel/actions/workflows/build-with-bal-test-native.yml)
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-[Microsoft Excel](https://www.microsoft.com/en-ww/microsoft-365/excel) is a spreadsheet application developed by Microsoft in Microsoft Office 365.
+[Excel](https://www.microsoft.com/en-ww/microsoft-365/excel) is a widely used spreadsheet application developed by Microsoft, enabling users to organize, analyze, and visualize data in a tabular format.
 
-This connector provides operations for connecting and interacting with Microsoft Graph API Excel endpoints over the network.  
-For more information about configuration and operations, go to the module. 
-- [`microsoft.excel`](excel/Module.md) - Perform CRUD operations in Microsoft Excel worksheet table, and chart.
+The `ballerinax/microsoft.excel` package offers APIs to connect and interact with [Microsoft Graph](https://learn.microsoft.com/en-us/graph/api/resources/excel?view=graph-rest-1.0 ) to allow web and mobile applications to read and modify Excel workbooks stored in OneDrive for Business, SharePoint site or Group drive.
+
+## Set up Excel API
+
+To use the Excel connector, You have to use the [Microsoft identity platform](https://learn.microsoft.com/en-us/entra/identity-platform/) to authenticate Excel APIs. If you do not have a valid Microsoft Azure AD account, you can sign up for one through the [Azure Portal](https://portal.azure.com/).
+
+### Step 1: Register your app in Azure Active Directory (Azure AD)
+
+1. Go to the [Azure portal](https://portal.azure.com/) and sign in with a global administrator account.
+
+2. Select **Microsoft Entra ID** from the left-hand navigation menu.
+
+3. Select **App registrations** from the **Manage** section of the left-hand navigation menu.
+
+4. Select **New registration**.
+
+5. In the Register an application page, enter a name for your app.
+
+6. Select the **supported account types** is **Accounts in any organizational directory (Any Microsoft Entra ID tenant - Multitenant)** .
+
+7. Select the **Web application** type and enter the URL under the **Redirect URI**.
+
+8. Click on **Register**.
+
+   ![Register App](https://raw.githubusercontent.com/ballerina-platform/module-ballerinax-microsoft.excel/master/docs/setup/resources/register_app.png)
+
+### Step 2: Configure app permissions
+
+1. In the left pane, select **App registrations**. 
+
+2. Go to the **Owned applications** and select the app you registered in Step 1. 
+
+3. In the Manage section, select **API permissions**.
+
+4. Click on **Add a permission**. 
+
+5. Select **Microsoft Graph**. 
+
+6. Select the **Delegated permissions scope**. 
+
+7. Click on **Add permissions**.
+
+   ![Add App Permissions](https://raw.githubusercontent.com/ballerina-platform/module-ballerinax-microsoft.excel/master/docs/setup/resources/add_app_permission.png)
+
+### Step 3: Create a client secret
+
+1. In the left pane, select **App registrations**.
+2. Go to the **Owned applications** and select the app you registered in Step 1.
+3. In the Manage section, select **Certificates & secrets**. 
+4. Click on **New client secret**. 
+5. Enter a **Description** for the client secret and select the **Expires** time period according to your purpose. 
+6. Click on **Add**. 
+7. Copy the **value** of the client secret. You will need this value later.
+
+   ![Create Client Secret](https://raw.githubusercontent.com/ballerina-platform/module-ballerinax-microsoft.excel/master/docs/setup/resources/create_client_secrets.png)
+
+### Step 4: Get the renew refresh token
+
+Use the following table to change the value of the fields in the sections below:
+
+   | Field                    | Values of your app                                         |
+   |------------------------------------------------------------| -------------------- |
+   | Tenant ID        | Directory (tenant) ID                                      |
+   | Name                     | Application (client)                                       |
+   | Authorized Redirect URIs | Redirect URI eg:http%3a%2f%2flocalhost%3a8080              |
+   | Scope                    | Delegated permissions scope eg: Files.Read Files.ReadWrite |
+
+   ![Details of App](https://raw.githubusercontent.com/ballerina-platform/module-ballerinax-microsoft.excel/master/docs/setup/resources/deatils_of_app.png)
+
+#### Get an authorization code
+
+Open a new tab in your browser and enter the following URL after replacing the values of the query parameters with the values of your application.
+   ```
+   https://login.microsoftonline.com/{Tenant ID}/oauth2/v2.0/authorize?client_id={AppReg ID}
+   &response_type=code
+   &redirect_uri={Redirect URI}
+   &response_mode=query
+   &scope={SCOPE}&sso_reload=true
+   ```
+#### Get a refresh token
+
+After replacing the values of the query parameters with the values of your application, open a terminal and enter the following curl command.
+
+```
+  curl -X POST -H "Content-Type: application/x-www-form-urlencoded" -d 'client_id={AppReg ID}
+  &scope={SCOPE} openid profile offline_access
+  &code={authorization code}
+  &redirect_uri={Redirect URI}
+  &grant_type=authorization_code
+  &client_secret={AppReg Secret}' 'https://login.microsoftonline.com/{Tenant ID}/oauth2/v2.0/token'
+```
+
+#### Get a refresh token to renew an expired access token
+
+Using the following cul command, you can get a refresh token to renew an expired access token.
+
+```
+  curl --location --request POST 'https://login.microsoftonline.com/{Tenant ID}/oauth2/v2.0/token' \
+   --header 'Content-Type: application/x-www-form-urlencoded' \
+   --data-urlencode 'client_id={AppReg ID}' \
+   --data-urlencode 'scope={SCOPE}' \
+   --data-urlencode 'refresh_token={Refresh token} \
+   --data-urlencode 'grant_type=refresh_token' \
+   --data-urlencode 'client_secret={AppReg Secret}'
+```
+
+## Quickstart
+
+To use the `excel` connector in your Ballerina application, modify the `.bal` file as follows:
+
+### Step 1: Import the connector
+
+Import the `ballerinax/microsoft.excel` package into your Ballerina project.
+
+```ballerina
+import ballerinax/microsoft.excel;
+```
+
+### Step 2: Instantiate a new connector
+
+Create a `excel:ConnectionConfig` with the obtained OAuth2.0 tokens and initialize the connector with it.
+
+```ballerina
+excel:Client excelClient = check new excel:Client(
+    config = {
+        auth: {
+            clientId: "<client_id>",
+            clientSecret: "<client_secret>",
+            refreshToken: "<refresh_token>",
+            refreshUrl: "<refresh_url>"
+        }
+    }
+);
+```
+
+### Step 3: Invoke the connector operation
+
+Now, utilize the available connector operations.
+
+#### Add worksheet
+
+```ballerina
+excel:Worksheet|error response = excelClient->createWorksheet(workBookId, {name: "test"});
+```
+
+#### Get Worksheet
+
+```ballerina
+excel:Worksheet|error response = excelClient->getWorksheet(itemId, workBookId, worksheetName);
+```
 
 ## Building from the source
+
 ### Setting up the prerequisites
 
 1. Download and install Java SE Development Kit (JDK) version 11. You can install either [OpenJDK](https://adoptopenjdk.net/) or [Oracle JDK](https://www.oracle.com/java/technologies/javase-jdk11-downloads.html).