title: How to run an existing REACT project
body: <p>Beginner here, please help.
  (1)If I have the files of a react project which was built on codesandbox or by another dev, how do I run the app and make changes in VSCode on my own machine.
  (2)How do I run an existing personal create-react-app project on my machine, so as to continue buliding?</p>