[Feature]: Add GitHub Action for Automatic Assignee Assignment

[harmeetsingh11]

Description:
Currently, it would be beneficial to have an automated workflow that assigns the pull request author as an assignee of the pull request. This streamlines the process, ensuring that the person who initiated the changes is automatically assigned.

Proposed Solution:
Implement a GitHub Action that automatically assigns the pull request author as an assignee whenever a new pull request is created.

Expected Behavior:
When a pull request is created, the GitHub Action should automatically assign the pull request author as an assignee, simplifying the assignment process.

Additional Considerations:

• Ensure compatibility with the existing repository structure and workflows.
• Test the action thoroughly to avoid any unintended side effects.
• Consider any exceptions or edge cases in the assignment process.

Checklist

• I have starred the repository
• I have checked the existing issues
• I have read the discussion tab thoroughly and got the project idea
• I am willing to work on this issue
• I am an IWOC 2024 contributor

[github-actions]

Congratulations, @harmeetsingh11! 🎉 Thank you for creating your issue for mocker project. Your contribution is greatly appreciated and we look forward to working with you to resolve the issue. Keep up the great work! Should you have any queries or require guidance, do not hesitate to ask.