Add symreader-native myget feed

Author: khyperia

NuGet.Config

@@ -11,5 +11,6 @@
     <add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" />
     <add key="AspNetCurrent" value="https://dotnet.myget.org/F/aspnet-feb2017-patch/api/v3/index.json" /> 
     <add key="web-api" value="https://dotnet.myget.org/F/dotnet-web/api/v3/index.json" />
+    <add key="symreader-native" value="https://dotnet.myget.org/F/symreader-native/api/v3/index.json" />
   </packageSources>
 </configuration>