Update README.md

Author: Shrikanth Ravi

README.md

@@ -5,6 +5,8 @@ Still in Active development.
 
 <img src="https://drive.google.com/uc?id=1tOocqnS0pI6V07-JROte0Rx7vqMqFmPg" width="300" >
 
+[![Android Arsenal]( https://img.shields.io/badge/Android%20Arsenal-Collapsible--Calendar--View--Android-green.svg?style=flat )]( https://android-arsenal.com/details/1/6829 )
+
 ### Version
 [![](https://jitpack.io/v/shrikanth7698/Collapsible-Calendar-View-Android.svg)](https://jitpack.io/#shrikanth7698/Collapsible-Calendar-View-Android)