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

[praptisharma28]

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.

[praptisharma28]

Please assign me this @Rakesh9100 under iwoc24

[praptisharma28]

@shelcia #331 have a look.