Add a Code of Conduct

## Description

Create a Code of Conduct which the Mentors and Participants must abide by.

## Additional Details

- Mention the Standards which everyone should abide by on welcoming and inclusive language including constructive criticism.
- Add the required responsibilities for Project Maintainers.
- Mention the Scope of this Code of Conduct.

No target file or test is named. Start by checking the repository for existing community or documentation files, then create the Code of Conduct covering welcoming and inclusive language, constructive criticism, maintainer responsibilities, and its scope; done means all requested sections are present and understandable to mentors and participants.

Written by the indexing model from the issue text.