add dependabot config

.github/dependabot.yml

@@ -0,0 +1,26 @@
+version: 2
+updates:
+  # Fetch and update latest `nuget` pkgs
+  - package-ecosystem: "nuget"
+    directory: "/"
+    schedule:
+      interval: "daily"
+      time: "00:00"
+    open-pull-requests-limit: 10
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+
+  # Fetch and update latest `github-actions` pkgs
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      time: "00:00"
+    labels:
+      - "skip-changelog"
+    open-pull-requests-limit: 10
+    commit-message:
+      prefix: "ci"
+      include: "scope"
+