Add nuget.config for registry consistency (#176)

* Add target-branch: main

* chore: add nuget.config to ensure registry consistency with updater.yml

Author: trejjam

.github/updater.yml

@@ -13,6 +13,7 @@ updates:
   - package-ecosystem: "nuget"
     directory: "src"
     targetFramework: net10.0
+    target-branch: main
     execute-restore: true
     groups:
       microsoft:

nuget.config

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<configuration>
+    <packageSources>
+        <clear />
+        <add key="nuget"
+             value="https://api.nuget.org/v3/index.json"
+             protocolVersion="3" />
+
+    </packageSources>
+    <packageSourceMapping>
+        <packageSource key="nuget">
+            <package pattern="*" />
+        </packageSource>
+    </packageSourceMapping>
+</configuration>