It's code, git clone then build. If there is a standard makefile it's super easy. If it's some modern age hispter trash build system you're in for some pain.
You know, with so many frameworks with the weirdest names, I honestly don't know if people are just joking or not...
"Yeah! just use turtle and chubby" "Oh! I prefer tuktuk and lollipop"
Funny bit: I totally made those up, then went to GitHub, and found out there are real projects called like that. Lol!
Use the code to build a time machine, go back to the 1960s and learn to program using only text... /s
Now, seriously: normally, if it's an app, look for the "Releses" on the right. If there's a binary (compiled app) to download, it will be there. If the developers are cool, they'll include a download link directly on the Read Me file you see when you arrive at the repository.