Adding codeowner for better security

[nishnatadebnath]

Is your feature request related to a problem? Please describe.
Security concerns regarding the workflow run in forked repo.

Describe the solution you'd like
Code owners by github is a solution.
https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Approach to be followed (optional)
Add codeowners file to root directory

Additional context
Add any other context or screenshots about the feature request here.