Update README.md

Author: rutvik110

lib/flutter_design_challenges/twitter_profile_scroll/README.md

@@ -2,4 +2,6 @@
 
 <a target="_blank" href="https://github.com/rutvik110/Flutter-Animations/tree/master/lib/flutter_design_challenges/twitter_profile_scroll"><img src="https://media.giphy.com/media/EP4iS4RT411qqoIAY1/giphy.gif" width="49%"></a>
 
-### Supporting Article : Coming Soon
+### Supporting Article
+Following article goes through basics of achieving such complex scroll interactions which were used here.
+#### [Flutter Design Challenge : Spotify Album Scroll Interaction](https://takrutvik.com/flutter-design-challenge-spotify-album-scroll-interaction)