added nuget to nuget.config v2

Author: egil

nuget.config

@@ -1,14 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
-    <packageSources>
-        <clear />
-        <add key="nuget" value="https://api.nuget.org/v3/index.json" />
-        <add key="github" value="https://nuget.pkg.github.com/egil/index.json" />
-    </packageSources>
-    <packageSourceCredentials>
-        <github>
-            <add key="Username" value="egil" />
-            <add key="ClearTextPassword" value="1a419fdf4dba34c3ee2b659c9e5fa41a25273e09" />
-        </github>
-    </packageSourceCredentials>
+  <packageSources>
+    <add key="github" value="https://nuget.pkg.github.com/egil/index.json" />
+    <add key="NuGet official package source" value="https://api.nuget.org/v3/index.json" />
+  </packageSources>
+  <packageSourceCredentials>
+    <github>
+      <add key="Username" value="egil" />
+      <add key="ClearTextPassword" value="1a419fdf4dba34c3ee2b659c9e5fa41a25273e09" />
+    </github>
+  </packageSourceCredentials>
 </configuration>