add nuget .config to allow us to test pre-release avalonia
ADD
nuget.config
+
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+ <packageSources>
+ <clear/>
+ <add key="nuget.org" value="https://www.nuget.org/api/v2/" />
+ <add key="AvaloniCI" value="https://www.myget.org/F/avalonia-ci/api/v2" />
+ <add key="Avalonia-PRS" value="https://www.myget.org/F/avalonia-prs/api/v2" />
+ <add key="XamlBehaviors" value="https://www.myget.org/F/xamlbehaviors-nightly/api/v2" />
+ <add key="sharpgen" value="https://www.myget.org/F/sharpgentools/api/v3/index.json" />
+ <add key="cli-deps" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
+ <add key="netcore" value="https://dotnet.myget.org/F/dotnet-core/api/v3/index.json" />
+ <add key="Roslyn Nightlies" value="https://dotnet.myget.org/F/roslyn/api/v3/index.json" />
+ <add key="DockNightly" value="https://www.myget.org/F/dock-nightly/api/v2" />
+ </packageSources>
+</configuration>
\ No newline at end of file

add nuget .config to allow us to test pre-release avalonia