Add Quiz in Tutorial

Author: rcosta358

README.md

@@ -222,6 +222,12 @@ With the correct implementation, LiquidJava will report an error in line 11 of [
 
 ---
 
+## Quiz
+
+Test your knowledge about LiquidJava by taking a simple quiz available [here](https://rcosta358.github.io/liquidjava-tutorial/). Think you can get a perfect score?
+
+---
+
 If you encounter any problems or have any questions, feel free to send an email to:
 
 - [Ricardo Costa](mailto:rcosta.ms358@gmail.com)