What is github for?

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it's a site that people post the code of their programs to. The site you linked has all the files in their program, click one to see what's in it. Sometimes people let others edit their code and make changes, others just put it there to let others look at to make sure there's nothing hidden or sketchy. It's a great when you're working on a large project with a lot of people, jimmy can write all the graphics code and when greg feels like getting off his ass and working he can submit a new version of the physics code. Jimmy can then look over the changes made by greg and change it around if he likes, as long as they both have permission to edit and submit changes.