Add contributing.md

[ananyag309]

A CONTRIBUTING.md file is essential for open-source projects because it provides clear guidelines on how to contribute, ensuring consistency and quality. It streamlines the contribution process, making it easier for newcomers to get involved, and fosters a welcoming environment. The file helps maintainers manage contributions effectively by setting expectations for code reviews and conflict resolution. Additionally, it includes links to important resources and reinforces the project's code of conduct and licensing, promoting a respectful and legally sound collaborative community.

if possible please assign this issue to me under gssoc