Here are instructions for add Sass support to an app built with create-react-app. Hopefully this will be redundant when Sass support is built into the tool! Visit their form and let them know you need Sass support.
Install the create-react-app tool from npm. This will be installed globally. We also need to install the loaders needed for webpack, and we will save those as development dependencies.
npm install -g create-react-app
create-react-app your-app-name
cd your-app-name