The recommended way to get started with React is to use Create React App, which is a quick and easy way to get a build pipeline in place to support ES6 and JSX compilation. Framework7 React already has a template built with Create React App for you to use, and this is recommended for most users.
If your needs exceed what Create React App provides, or you prefer to create your own custom build pipeline leveraging Babel, Webpack, Rollup, etc., here are the steps to get started:
npm install react --save
npm install framework7-react --save
Add a script tag in your HTML for the browser version of the Babel compiler so you can use ES6 and JSX without having a build pipeline