npm install

install all the dependencies first to run the app

npm test

run the jest testing library to do the tests
configure the testing parameters to test.

Launches the test in the console.

npm run build

build a cross-browser supported JS code using babel
transpile ES5+ Javascript to Browser Supported JS

npm start

initially it will run node build/Play.js" using the script.

feel free to make some changes in package.json