A kind soul contributed an update to the README---basically the output of `cargo run --bin maze-maker -- --help.
I guess today's lesson is: do promote your personal project even when it's semi-arsed, because people on the Internet are mostly kind and will help you improve your documentation!
A friend of mine does coding live streams on Twitch. It's pleasantly surprising how many randos (who become internet friends) will help out with your projects.