Would it really hurt to include a screenshot of what it's like to use? Sorry for the grouchy comment but we're all busy people, there has to be a modicum of convincing on a programmers part to encourage us to divert us attention to their project.
EDIT: Added some screenshots to the bottom of the readme
In the long run you can diff the images and assert that they haven't changed more than N% from the reference, but for now, it makes evergreen documentation.
Full disclosure: I work on this project.