Add Dependabot configuration for automated dependency updates

Configure Dependabot to automatically check for dependency updates weekly on Tuesdays. Includes NPM updates for the Admin Client and NuGet updates for the main library, while ignoring Kentico packages for manual control.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: liamgold

.github/dependabot.yml

@@ -0,0 +1,32 @@
+version: 2
+updates:
+  # Maintain dependencies for Admin Client project (npm)
+  - package-ecosystem: "npm"
+    directory: "/src/Client/"
+    schedule:
+      interval: "weekly"
+      day: "tuesday"
+      time: "07:00"
+    ignore:
+      - dependency-name: "@kentico/*"
+    groups:
+      react:
+        patterns:
+          - "react*"
+          - "@types/react*"
+      webpack:
+        patterns:
+          - "webpack*"
+          - "*-loader"
+    open-pull-requests-limit: 5
+
+  # Maintain NuGet dependencies for main library
+  - package-ecosystem: "nuget"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "tuesday"
+      time: "07:00"
+    ignore:
+      - dependency-name: "Kentico.Xperience.*"
+    open-pull-requests-limit: 5