This one does have a screenshot, though, in the usual spot in the readme.
As someone unfamiliar with grub, the screenshot leaves me with more questions than answers
GRUB is a bootloader. A bootloader takes care of getting the operating system started up. It is also responsible for allowing the user to select between multiple operating systems at boot.
Ohh I thought this was a minecraft mod
Are you sure you clicked on the right link? The screenshot is at the very top of the readme.