Add gif to show how to use it

Author: laike9m

.gitignore

@@ -160,3 +160,5 @@ cython_debug/
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
+
+.DS_Store

README.md

@@ -4,6 +4,8 @@ Learn Python 🐍 typing (type hints) by completing online challenges.
 
 🌟🌟 Click **[HERE](https://python-type-challenges.zeabur.app)** to start 🌟🌟
 
+![](docs/images/usage.gif)
+
 Happy typing!
 
 ## How to Contribute