This project was bootstrapped with Create React App.
In the interest of transparency, I went over on time a little bit. I needed to spend some time writing the backend because the documentation URL was down at the time of development.
Running this project involves running both a backend server as well as the the application itself. You should still only need to execute npm start; however, you will need to make sure ports 8081 and 3000 are available.
If you wish you run only one or the other you can do this with either npm run start-react or npm run start-server for the front end or backend, respectively.