Add dependabot config for .NET

Author: Porges

.github/dependabot.yml

@@ -1,18 +1,22 @@
 version: 2
 updates:
   - package-ecosystem: cargo
-    directory: "/src/agent"
+    directory: src/agent
     schedule:
       interval: daily
     open-pull-requests-limit: 10
     ignore:
       - dependency-name: "*"
         update-types: ["version-update:semver-patch"]
   - package-ecosystem: cargo
-    directory: "/src/proxy-manager"
+    directory: src/proxy-manager
     schedule:
       interval: daily
     open-pull-requests-limit: 10
     ignore:
       - dependency-name: "*"
         update-types: ["version-update:semver-patch"]
+  - package-ecosystem: nuget
+    directory: src/ApiService
+    schedule:
+      interval: daily