Add dependabot config file (#2893)

* Add dependabot config file

Add dependabot config file.

* Add default labels for config

Add default labels for config.

.dependabot/config.yml

@@ -0,0 +1,47 @@
+version: 1
+
+update_configs:
+  - package_manager: "javascript"
+    directory: "/src/rest-server"
+    update_schedule: "live"
+    target_branch: "master"
+    default_reviewers:
+    - abuccts
+    - sunqinzheng
+    default_labels:
+    - "dependencies"
+    - "security"
+    - "javascript"
+    allowed_updates:
+    - match:
+        update_type: "security"
+
+  - package_manager: "javascript"
+    directory: "/src/webportal"
+    update_schedule: "live"
+    target_branch: "master"
+    default_reviewers:
+    - abuccts
+    - sunqinzheng
+    default_labels:
+    - "dependencies"
+    - "security"
+    - "javascript"
+    allowed_updates:
+    - match:
+        update_type: "security"
+
+  - package_manager: "javascript"
+    directory: "/contrib"
+    update_schedule: "live"
+    target_branch: "master"
+    default_reviewers:
+    - abuccts
+    - sunqinzheng
+    default_labels:
+    - "dependencies"
+    - "security"
+    - "javascript"
+    allowed_updates:
+    - match:
+        update_type: "security"