[Feature]: Add the GitHub action workflow for greeting contributors

[JiyaGupta-cs]

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 requests (PR) and issue creators, fostering a welcoming environment.

Proposed Changes:

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

Please assign me this issue under IWOC

[JiyaGupta-cs]

@1010varun Please assign it to me