Copy souces from Versions.props to NuGet.config

Author: juanam

NuGet.config

@@ -4,5 +4,10 @@
     <clear />
     <add key="dotnet-core" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
+    <add key="aspnet-blazor" value="https://dotnetfeed.blob.core.windows.net/aspnet-blazor/index.json" />
+    <add key="aspnet-extensions" value="https://dotnetfeed.blob.core.windows.net/aspnet-extensions/index.json" />
+    <add key="aspnet-entityframeworkcore" value="https://dotnetfeed.blob.core.windows.net/aspnet-entityframeworkcore/index.json" />
+    <add key="aspnet-aspnetcore-tooling" value="https://dotnetfeed.blob.core.windows.net/aspnet-aspnetcore-tooling/index.json" />
+    <add key="grpc-nuget-dev" value="https://grpc.jfrog.io/grpc/api/nuget/v3/grpc-nuget-dev" />
   </packageSources>
 </configuration>