[DOCUMENTATION] Create guide to contribute to Dev Protocol

[vinzvinci]

What would you like to share?

Only create using markdown, just telling the guide on how to start contributing to Dev Protocol

Additional information

No response

Code of Conduct

• [X] I agree to follow this project's Code of Conduct

[MatteuSan]

Yes please! This can also serve as a base template for specific repositories. (And selfishly, it helps me for Hashi lmao. I don't have any idea how to write good contributing guidelines)

[vinzvinci]

Thanks, added this to trello.