Added PostSharp.Samples.Blazor.AutoRetry. Updated the root readme.

Author: Alexander Dolin

README.md

@@ -48,9 +48,5 @@ or you can download them on [GitHub](https://www.github.com/postsharp/PostSharp.
 | **Threading**                 
 | [PostSharp.Samples.Threading.PingPong](Threading/PostSharp.Samples.Threading.PingPong/)             | The classic educational ping-pong example.                                                   | 
 | [PostSharp.Samples.Threading.ThreadDispatching](Threading/PostSharp.Samples.Threading.ThreadDispatching/) | A simple WPF progress bar updated from a background thread.                            | 
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+| **Platform Support**                 
+| [PostSharp.Samples.Blazor.AutoRetry](Blazor/PostSharp.Samples.Blazor.AutoRetry/) | Demonstrates a custom aspect used in a Blazor application. |