Added Coffee auth page challenge .gif

Author: Pedro Massango

README.md

@@ -28,6 +28,10 @@ Youtube playlist about Flutter: https://www.youtube.com/playlist?list=PLum90SMJW
 | <img src="https://github.com/pedromassango/slider_number_picker/blob/master/preview/shot.gif" width="270" height="480"> | <img src="/screenshots/profile_design.png" width="270" height="480"> | <img src="/screenshots/world_clock.png" width="270" height="480"> |
 
 
+| [Coffee App - Auth Page](https://github.com/pedromassango/my_flutter_challenges/blob/master/lib/coffee_app_auth.dart)
+| ------------- |
+| <img src="/screenshots/coffee_app_auth_page.gif" width="270" height="480"> |
+
 ## Getting Started
 
 This project is a starting point for a Flutter application.