[docs] Add `CONTRIBUTING.md` file to detail expectations for contributors

[pnc-nz]

Git branch prefixes

Using prefixes in branch names is a popular strategy to categorize branches based on their purpose:

• Feature branches: Prefixed with feature/, these branches are used to develop new features.
• Bugfix branches: Prefixed with bugfix/, these branches are used to make fixes.
• Release branches: Prefixed with release/, these branches prepare a codebase for new releases.
• Hotfix branches: Prefixed with hotfix/, these branches address urgent issues in production.

Git Flow branch naming conventions

Git Flow is a branching model that outlines a strict branching strategy designed for managing releases. The main branches in Git Flow include:

• Main branch: Serves as the primary branch where the codebase's current production state is reflected.
• Develop branch: Aggregates developments and features before they are released to the main branch.
• Feature branches: Typically follow the naming pattern feature/*, these branches are used to develop new features.
• Release branches: Named like release/*, these branches help manage the release process.
• Hotfix branches: Named hotfix/*, these branches are created to quickly patch production releases.

Source

• https://graphite.dev/guides/git-branch-naming-conventions