Run command npm install
For run 'dev' version use npm start. For build bundle to 'production' use npm build
After run command npm start project open in your 'default' browser. If it isn`t, open next link: http://localhost:8080/
If your browser google chrome, you need install extension for fix it. For example - Moesif Orign: https://chrome.google.com/webstore/detail/moesif-orign-cors-changer/digfbfaphojjndkpccljibejjbppifbc