Add GitHub Actions Workflow for Auto Commenting on Merged PRs

.github/workflows/auto-comment.yml

@@ -0,0 +1,25 @@
+name: Auto Comment on Merged PR
+
+on:
+  pull_request:
+    types: [closed]
+
+jobs:
+  comment:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Comment on merged pull request
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const pr_number = context.payload.pull_request.number;
+            const comment = "Thank you for your contribution! 🎉 Your pull request has been successfully merged.";
+            await github.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: pr_number,
+              body: comment
+            });