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Install Node if you don't have it already.
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Install
yarnandreact-scriptsglobally by running:
npm install --global yarn
Make sure to cd in to react-app/ to run these scripts
Installs required packages
Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.
The page will reload if you make edits.
You will also see any lint errors in the console.