It looks usable for someone who knows about genetic algorithm. It would be catchy on your repo if you add gif version of a working demo for simple use case such as snake game or something similar.
Thanks so much for your comment. There are some examples here: https://github.com/lodenrogue/genetic-algorithm-js/tree/mast...
If I were you I would take those examples, wrap them in some html and put them on github.io or somewhere else but with a link at the top of the readme. There is so much stuff around and only so little time...