Add greetings workflow for pull requests

.github/workflows/greetings.yml

@@ -0,0 +1,26 @@
+name: Greetings
+
+on:
+  pull_request:
+    types: [opened]
+    branches:
+      - main
+
+jobs:
+  greetings:
+    name: Greetings
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    if: github.event.action == 'opened'
+    steps:
+      - uses: actions/first-interaction@v1
+        with:
+          repo-token: ${{ secrets.GH_TOKEN }}
+          pr-message: |-
+            Hey there, Pull Request Pioneer! 🚀 
+
+            A big round of applause for stepping into the ring with your very first Pull Request! Thanks a bunch for showing Ivy some love! 🎉
+
+            Just a friendly heads-up:
+            - We're all about keeping things cozy here, so feel free to ask questions, share ideas, and make yourself at home! 🏠
+            - If you're feeling lost or need a little guidance, don't hesitate to reach out. We're all in this together! 🤝