Automated "greetings" workflow

[souvikpramanikgit]

Description:
I propose to implements a new GitHub Actions workflow named "Greetings," which automatically greets users who open new issues or pull requests in this repository.

Key Features:

• Automatic Greeting: Users will receive an immediate acknowledgment when they create an issue or pull request. The messages are:
  For Issues: "👋 Thank you for raising an issue! We appreciate your effort in helping us improve. Our team will review it shortly. Stay tuned!"
• For Pull Requests: "🎉 Thank you for your contribution! Your pull request has been submitted successfully. A maintainer will review it as soon as possible. We appreciate your support in making this project better."

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[github-actions]

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