XERS

Please use Yarn only, forgot for npm ...

    yarn start (run application)
    yarn build (build application)
    yarn test (test application)
    yarn eject (eject package.json)

environment

    .env
    REACT_APP_ENV= (local | development | production)
    REACT_APP_API_BASE_URL= (api url)
    PORT=(local port for example 2394)