message: dotnet: Add dotnet sdk install link
diff: @@ -18,7 +18,7 @@ Implement your server scripts in C# (and other dotnet languages)
  ### Dependencies
  -You will need `dotnet-sdk-3.0` installed on the server to use this plugin. The same package is used to build the managed code.
  +You will need `dotnet-sdk-3.0` installed on the server to use this plugin. The same package is used to build the managed code. Installation instructions are [here](https://dotnet.microsoft.com/download/linux-package-manager/sdk-current).
  There are no compiletime dependencies for the unmanaged code.
  