updated README

add badge from android arsenal

Author: bopbi

README.md

@@ -6,4 +6,6 @@ the scroll detector is using technique from [http://stackoverflow.com/questions/
 
 example video:
 
-[![Video Example](http://img.youtube.com/vi/BbMvH5jAqA8/0.jpg)](http://www.youtube.com/watch?v=BbMvH5jAqA8)
+[![Video Example](http://img.youtube.com/vi/BbMvH5jAqA8/0.jpg)](http://www.youtube.com/watch?v=BbMvH5jAqA8)
+
+[![Android Arsenal](https://img.shields.io/badge/Android%20Arsenal-Android--Parallax--ListView--Item-brightgreen.svg?style=flat)](https://android-arsenal.com/details/1/1217)