[Feature] Add GitHub action workflow for greeting contributors

[harmeetsingh11]

Description

The current project lacks an automated action to greet contributors. GitHub Actions can significantly enhance project automation. I propose adding a GitHub Action workflow to greet new pull request (PR) and issue creators, fostering a welcoming environment.

Proposed Changes: Implement a GitHub Action workflow that triggers on new PRs and issues. The workflow should include a greeting message to acknowledge and appreciate the contributors for their efforts.

Expected Behavior: When contributors create new PRs or issues, the GitHub Action should automatically trigger and post a welcoming message, acknowledging their contributions.

Screenshots

No response

Checklist

• [X] I have checked the existing issues.
• [X] I follow Contributing Guidelines of this project.
• [X] I am a IWOC'24 contributor.
• [ ] I am a JWOC'24 contributor.
• [X] I am a SWOC'24 contributor.

Code of Conduct

• [X] I agree to follow this project's "Code of Conduct".

[Rakesh9100]

Issue is already open for this @harmeetsingh11