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.

The issue names no target file or test. First inspect the repository for existing community or contributor documents and choose the project’s established location for a Code of Conduct. Done means the document covers welcoming and inclusive language, constructive criticism, maintainer responsibilities, and its scope for mentors and participants.

Written by the indexing model from the issue text.