Add BlazorSignalR library (aspnet#241)

Author: csnewman

community.md

@@ -13,6 +13,7 @@ Below is a list of projects and resources from the Blazor community (links in ea
 * [BlazoredLocalStorage](https://github.com/chrissainty/BlazoredLocalStorage) – A library to provide access to local storage in Blazor apps.
 * [BlazorMaterial](https://github.com/BlazorExtensions/BlazorMaterial) – Blazor components implementing Google's Material components for web ([Material Design: Web](https://material.io/components/web)).
 * [Blazorous](https://github.com/chanan/Blazorous) – Maintainable CSS with Blazor.
+* [BlazorSignalR](https://github.com/csnewman/BlazorSignalR) – ASP.NET Core SignalR Core .NET client support for Blazor.
 * [BlazorStorage](https://github.com/cloudcrate/BlazorStorage) – Blazor local and session storage support.
 * [BlazorStrap](https://github.com/chanan/BlazorStrap) – Bootstrap 4 Components for Blazor.
 * [Blazor Fluxor](https://mrpmorris.github.io/blazor-fluxor/) – Flux/Redux library