Added RottenUI sample

Author: jsuarezruiz

README.md

@@ -8,6 +8,25 @@ A curated list of awesome **Xamarin.Forms** samples to show how to create **good
 
 *Would you like to see more goodlooking UI samples?. Do you know **[Snppts](https://snppts.dev)**?*
 
+## [RottenUI](https://github.com/kphillpotts/RottenUI)
+
+A Xamarin.Forms UI Challenge.
+
+<img src="images/rottenui.png" Width="250" /> 
+
+### Platforms
+
+Android, iOS.
+
+### Features:
+- SkiaSharp.
+- PancakeView.
+- Custom tabs.
+
+### More information:
+- Source code: [https://github.com/kphillpotts/RottenUI](https://github.com/kphillpotts/RottenUI)
+- Author: [Kym Phillpotts](https://twitter.com/kphillpotts)
+  
 ## [Mountain Mobile](https://github.com/kphillpotts/MountainMobile)
 
 A Xamarin.Forms UI Challenge playing with SkiaSharp and animations.