Add commitizen

[dannytce]

When you commit with Commitizen, you'll be prompted to fill out any required commit fields at commit time. No more waiting until later for a git commit hook to run and reject your commit (though that can still be helpful). No more digging through CONTRIBUTING.md to find what the preferred format is. Get instant feedback on your commit message formatting and be prompted for required fields. https://github.com/commitizen/cz-cli

• Can be used as prepare-commit-msg
• We can apply it both for this repository and as commitlint package's recommended extension