Update README.md

README.md

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 # kivy-calculator
-A Caulculator writen by Python with Kivy
+A Calculator was written by Python with Kivy
+
+# Dependances
+- [Kivy](https://kivy.org/#download)
+
+## install
+### kivy
+You can install kivy by following [document](https://kivy.org/#download)
+
+**For example (Ubuntu)**
+Add PPAs
+```shell
+sudo add-apt-repository ppa:kivy-team/kivy
+```
+install kivy
+```shell
+sudo apt-get update
+sudo apt-get install python3-kivy # for python2, you can type python-kivy to install
+```
+# Run it
+## Clone or Download source code
+```shell
+git clone https://github.com/lagagain/kivy-calculator
+cd kivy-calculator
+```
+## Just Run
+```shell
+python3 src/main.py
+# or `python src/main.py`
+```
+
+# Screen Shot
+![calculator-kivy.png](https://i.postimg.cc/0QzcbvjB/calculator-kivy.png)
+
+# History
+This wrote before 2017, maybe in 2016.  At that time, I remember Kivy version just 1.0.7.  I try it again with installing kivy 1.11.0 and Python3.5 at LinuxMint 18.3 in 2019, and it still works, then I open is source now.