Update README.md

Author: ascott18

README.md

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 A Microsoft SQL Server backplane for ASP.NET Core SignalR.
 
-![Nuget](https://img.shields.io/nuget/v/IntelliTect.AspNetCore.SignalR.SqlServer)
+[![Nuget](https://img.shields.io/nuget/v/IntelliTect.AspNetCore.SignalR.SqlServer)](https://www.nuget.org/packages/IntelliTect.AspNetCore.SignalR.SqlServer/)
 
 
 This project is largely based off of a fork of the [SignalR Core Redis provider](https://github.com/dotnet/aspnetcore/tree/main/src/SignalR/server/StackExchangeRedis), reworked to use the underlying concepts of the [classic ASP.NET SignalR SQL Server backplane](https://github.com/SignalR/SignalR/tree/main/src/Microsoft.AspNet.SignalR.SqlServer). This means it supports subscription-based messaging via SQL Server Service Broker, falling back on periodic polling when not available.