Add GitHub Action to welcome new contributors

.github/workflows/first-interaction.yml

@@ -0,0 +1,26 @@
+name: 'Welcome New Contributors'
+
+on:
+  issues:
+    types: [opened]
+  pull_request:
+    types: [opened]
+
+jobs:
+  welcome:
+    permissions:
+      issues: write          # allow posting on issues
+      pull-requests: write   # allow posting on PRs
+    runs-on: ubuntu-latest
+    steps:
+      - name: 'Welcome new users'
+        uses: actions/first-interaction@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          issue-message: |
+            👋 Hello and welcome! Thank you for opening your first issue.  
+            We're happy to have you here — feel free to ask any questions if you're unsure about anything.
+
+          pr-message: |
+            🎉 Thanks for your first pull request!  
+            We appreciate your contribution and look forward to reviewing it.