Merge branch 'issues/12'
* issues/12: pyproject.toml: Update project version to 0.2.0 README: Extend with information on arch-release-sync example.toml: Add synchronization related documentation Add script entrypoint for arch-release-sync cli: Add entrypoint for arch-release-sync files: Add ProjectFiles class to handle synchronization gitlab: More explicit print when downloading build artifacts gitlab: Implement download of promotion artifact argparse: Add parser for arch-release-sync gitlab: Change signature of constructor gitlab: More generically retrieve types of releases config: Make PRIVATE_TOKEN optional config: Add integration to configure synchronization