Update CONTRIBUTING.md

[XV02]

Summary of changes

This pull request includes following changes.

• Adds naming conventions docs.

Description

Added Naming conventions for branches and commits to the Contributing markdown file.

Closes #526 Related #460 Related #515

Type of change

• Documentation

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have confirmed my fix is effective or that my feature works

[XV02]

Turning into draft until we reach an agreement with the community contributors.