doc: add governance

[thealpha93]

A set of rules to be followed by all the projects

Pull Request Template

Description

This document contains a set of rules / governance to be followed by all the projects in the nullcast community

Fixes # (issue)

Type of change

• This change requires a documentation update

How Has This Been Tested?

This one does not need to be tested. But it needs to be reviewed

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings