Update README

Author: bwnyasse

README.md

@@ -68,6 +68,5 @@ Flutter has 3 types of tests.
 
 ## Purpose
 
-Through a flutter movie application , this project demonstrate how to implement **unit** , **widgets** and **integration** tests in your application.
-
+Through a flutter movie application, this repository is the code source of my [codelab](https://codelabs-bwnyasse-net.web.app/flutter_testing_tutorial.html#0) that provides a step by step approach for testing your flutter application.