Add GitHub Actions workflow to greet new contributors

[cb-ashik]

Description

This commit adds a new GitHub Actions workflow file, greeting.yml, which is triggered when new issues or pull requests are opened.

The workflow includes the following steps:

• For issues: If a new issue is opened, a comment is created to greet the contributor and express appreciation for their contribution.
• For pull requests: If a new pull request is opened, a comment is created to thank the contributor for their pull request and inform them that their request will be reviewed.

Related Issues

N/A

Additional Information

This workflow aims to improve the onboarding experience for new contributors and foster a welcoming environment in the project.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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[github-actions[bot]]

Thank you, @cb-ashik, for the pull request. We will take a look at it and get back to you shortly.