Added greeting workflow

.github/workflows/greetings.yml

@@ -0,0 +1,71 @@
+# This workflow greets new contributors to the project
+#
+# It comments on first-time issues and pull requests to welcome users
+# and provide helpful information about contributing to the project.
+
+name: 'Greet New Contributors'
+
+on:
+  issues:
+    types: [opened]
+  pull_request_target:
+    types: [opened]
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  greeting:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Greet First Time Contributors
+        uses: actions/first-interaction@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+
+          issue-message: |
+            👋 **Welcome to OpenML!**
+
+            Thank you for opening your first issue! We're excited to have you as part of our community. 🎉
+
+            A maintainer will review your issue soon. In the meantime, please make sure you've provided:
+            - A clear description of the issue
+            - Steps to reproduce (if applicable)
+            - Expected vs actual behavior
+            - Any relevant logs or screenshots
+
+            **Helpful Resources:**
+            - 📖 [Documentation](https://www.openml.org/guide)
+            - 🤝 [Contributing Guidelines](../CONTRIBUTING.md)
+            - 💬 [Code of Conduct](../CODE_OF_CONDUCT.md)
+
+            If you'd like to work on this issue yourself, please comment below and we'll be happy to guide you!
+
+            Thank you for helping make OpenML better! 🙌
+
+          pr-message: |
+            👋 **Welcome to OpenML!**
+
+            Thank you for opening your first pull request! We're thrilled to have you contribute to the project. 🎉
+
+            A maintainer will review your PR soon. Please make sure:
+            - [ ] Your code follows our coding standards
+            - [ ] You've tested your changes locally
+            - [ ] You've updated documentation if needed
+            - [ ] All tests pass
+            - [ ] You've filled out the PR template completely
+
+            **Helpful Resources:**
+            - 📖 [Documentation](https://www.openml.org/guide)
+            - 🤝 [Contributing Guidelines](../CONTRIBUTING.md)
+            - 💬 [Code of Conduct](../CODE_OF_CONDUCT.md)
+
+            **What happens next?**
+            1. Automated checks will run on your PR
+            2. A maintainer will review your code
+            3. You may be asked to make some changes
+            4. Once approved, your PR will be merged! 🚀
+
+            Thank you for your contribution! We appreciate your effort in making OpenML better! 🙌