The itch app should let you view local files (maybe right click on the game?), but if it doesn't, you can see the README online here: https://github.com/y2bd/junk/blob/master/README_DISTRIB.md
Also note that this only works on the Windows version of the game. Unfortunately I've not been able to get my hands on a Mac to republish the game with the latest changes yet, apologies if that's what you're playing.