yarn react and materialui

open cmd with admin rights:
choco install yarn
close this cmd and open a "normal" cmd

yarn create react-app app
cd app
yarn add bootstrap@4.1.3 react-cookie@3.0.4 react-router-dom@4.3.1 reactstrap@6.5.0
yarn add @material-ui/core
yarn start


in App.js:


import React, {Component} from 'react';
import './App.css';
import Button from '@material-ui/core/Button';
import Table from '@material-ui/core/Table';
import TableRow from '@material-ui/core/TableRow';
import TableCell from '@material-ui/core/TableCell';