Add Code of conduct.md

[rashiranjan22]

@Deekshit7483 kindly assign this issue to me under gssoc'24

[Deekshit7483]

What code will you add for conduct.md?

[rashiranjan22]

Conduct.md is actually called "code_of_conduct.md", it includes guidelines for contributors.
A code of conduct is important because it sets clear expectations for behavior, fostering a respectful and inclusive environment. It helps prevent misconduct and conflicts by outlining acceptable and unacceptable actions.