How to add more games to NES Mini Classic using hakchi2 and a Mac

The NES Mini Classic is a wonderful little box. It captures most of the old gaming feeling by putting you close to the screen and giving you authentic feeling controllers. That all while displaying everything in a modern fashion on a up-to-date HDMI-capable device or TV.
Also part of the thrill is that it gives you all that good old classic games in it’s 30 game line-up so that you can play everything that you loved during the 90s. Everything? Just barely.