Clone, contribute, create a pull request, and nudge philadams to review it. Do remember to add yourself to CONTRIBUTORS.md.
Work gets a bit crazy at times, so there might be a short wait, but I'll get to your PR as soon as possible! Thank you for your interest in the project and for contributing your time.
Remember to update the Habitica command line tool page on the Habitica wikia with the latest release number and date.