docs add nuget options

Dockerfile

@@ -58,7 +58,7 @@ COPY ./notebooks/ ${HOME}/notebooks/
 
 # Copy package sources
 
-COPY ./NuGet.config ${HOME}/nuget.config
+COPY ./nugetprops.config ${HOME}/nuget.config
 
 RUN chown -R ${NB_UID} ${HOME}
 USER ${USER}

nugetprops.config

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <solution>
+    <add key="disableSourceControlIntegration" value="true" />
+  </solution>
+  <packageSources>
+    <clear />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
+    <add key="dotnet3-dev" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet3.1/nuget/v3/index.json" />
+    <add key="dotnet-core" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
+    <add key="dotnet-tools" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json" />
+    <add key="PSGallery" value="https://www.powershellgallery.com/api/v2/" />
+  </packageSources