When open up the folder, look at .env.example and create a .env with the following infos:
OAUTH_TOKEN=yourAuthTokenFromGitHub
REQUEST_URL=yourRequestUrlLook how to get your github auth token here.
You just need to run node src/index.js in your command prompt. But, before that, you must to install all dependencies using npm install.
Just access <yourHost>:3333/ using your browser or something else what do HTTP requests, and the all repositories data from github API will appears ;).