ensure correct feeds are used for ci build

NuGet.Config

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <add key="Build Packages" value="https://www.myget.org/F/c037199d-41df-4567-b966-25ff65324688/api/v3/index.json" />
+    <add key="NuGet.org" value="https://api.nuget.org/v3/index.json" />
+  </packageSources>
+</configuration>