👍🎉 First off, thanks for taking the time to contribute! 🎉👍
$ git clone url-to-git-repository
$ cd path-to-package/
$ python -m SimpleHTTPServer 8080
Local setup is ready on http://localhost:8080/snake.html
In open source, I think the learning happens when you go through the code & try to understand how it works, learn a thing or two from patterns & the way code is written. For any feature you might be working on, I'll advice just run the app, put debugger points in chrome & go step by step to understand how it works. Happy contributing ! :)