Update nuget.config

nuget.config

@@ -1,8 +1,10 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
+
 <configuration>
   <packageSources>
     <clear />
-    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
-    <add key="AvaloniaCI" value="https://nuget.avaloniaui.net/repository/avalonia-all/index.json" />
+    <add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" />
+    <add key="avalonia" value="https://nuget.avaloniaui.net/repository/avalonia-all/index.json" protocolVersion="3" />
+    <add key="skiasharp" value="https://aka.ms/skiasharp-eap/index.json" protocolVersion="3" />
   </packageSources>
 </configuration>