adding GitHub action to close our PRs automatically

Author: Upkar Lidder

.github/workflows/main.yml

@@ -0,0 +1,14 @@
+name: Close Pull Request
+
+on:
+  pull_request_target:
+    types: [opened]
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: superbrothers/close-pull-request@v3
+      with:
+        # Optional. Post a issue comment just before closing a pull request.
+        comment: "We appreciate your contributions. However, please create PRs on your fork and not on the original project repository. Thank you!"