Add BlazorPong back to the sample project list

Add BlazorPong back to the list of Blazor sample project, it was deleted by a PR : #19

README.md

@@ -56,6 +56,7 @@ Please note that if you want to open Blazor projects in Visual Studio, you must
 * [BlazorChatSample](https://github.com/conficient/blazorchatsample) Blazor chat demo using SignalR JS client with interop.
 * [BlazorElectronExperiment](https://github.com/SteveSandersonMS/BlazorElectronExperiment.Sample) Exploring how a Blazor could be used to build a cross-platform desktop application using [Electron](https://electronjs.org/).
 * [BlazorNasaImages](https://github.com/ncarandini/BlazorNasaImages) A sample Blazor app that fetches the Nasa Astronomy Picture of the Day.
+* [BlazorPong](https://github.com/ctrl-alt-d/blazorpong) 8 bits pong with blazor and signalR. Warning: Blazor Pong is not finished and is stopped with a knowed SignalR issue with blazor.
 * [BlazorServerTree](https://github.com/ctrl-alt-d/BlazorServerTree) A simple Server-Side Blazor sample app to deal with hierarchical data.
 * [Blazorships](https://github.com/bjorndaniel/Blazorships) Blazorships, a Blazor implementation of Battleship using SignalR.
 * [Blazor Survey](https://github.com/nutshellit/Blazor-Survey) A hybrid F#/C# blazor sample app to kick the tyres of blazor.