Add Contribution Guidelines

[sidiousvic]

The last major devOps issue in the foreseeable future. We need contribution guidelines to guide new contributors to the flow.

• Should have instructions based on GitHub Flow, Standard Fork and PR Workflow with command examples.
• Should mention production and dev branches:
• • Fork, commit, push, PR into dev.
• • Should update CHANGELOG.md.
• Should mention Prettier config
• Should mention build checks
• Should mention tests
• Should mention Kermitoid and checks
• [Good to have] An overview of the architecture of Phantom (this can also be another document)

[sidiousvic]

closed via #44