Customize greetings for first-time issues and PRs

Updated greetings.yml to specify event types for pull requests and issues, and customized greeting messages for first-time contributors.

Author: aadityansha06

.github/workflows/greetings.yml

@@ -0,0 +1,41 @@
+name: Greetings
+
+on:
+  pull_request_target:
+    types: [opened]
+  issues:
+    types: [opened]
+
+jobs:
+  greeting:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+    - uses: actions/first-interaction@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        issue-message: |
+          Hello @${{ github.event.issue.user.login }}! 👋
+          
+          Thank you for opening your first issue in this repository! This is an automated message from Aadityansha.
+          
+          I really appreciate you taking the time to contribute. I'll review your issue as soon as possible and get back to you.
+          
+          In the meantime, please make sure you've provided all the necessary details to help me understand and address your concern.
+          
+          Happy coding! (⁠ ⁠◜⁠‿⁠◝⁠ ⁠)⁠♡
+          
+        pr-message: |
+          Hello @${{ github.event.pull_request.user.login }}! 👋
+          
+          Thank you for opening your first pull request in this repository! This is an automated message from Aadityansha.
+          
+          I'm excited to see your contribution! I'll review your PR as soon as possible. Please make sure:
+          - Your code follows the project's coding standards
+          - No merge conflict 
+          - You've provided a clear description of your changes
+          - If possible provide img of working feature 
+          
+          Thanks for contributing to this project! (⁠◍⁠•⁠ᴗ⁠•⁠◍⁠)⁠❤