Download the .jar-file from the desired release page (on the right side on GitHub) and drop it into your Minecraft mods directory. (This can usually be found in ~/.minecraft/mods/ or on Windows %AppData%\.minecraft\mods\)
The code is a mess currently. It was intended to be an experiment and after hours of trying to render a simple line this is the frustrated and piled code result. The results were too good not to share, so here they are. I would probably have to lie if I said plans are to refactor the code eventually, but there is a chance I will.
If you want to contribute, fork the repository and use pull requests. Follow common FOSS processes.
Copyright 2021 Timo Zuccarello
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