Material Design Bootstrap configure is just fun in React app. Here I show you create and add mdb in react app using yarn package.

Step. 1
            Create a new React App
                 $ yarn create react-app "your_app_name"
Step 2.
           move working directory in "your_app_name"
Step 3.
          Then its time to add MDB react in your created app
               $ yarn add mdbreact

          Import following header in index.js file inside src directory
             import "@fortawesome/fontawesome-free/css/all.min.css";
      import 'bootstrap-css-only/css/bootstrap.min.css'; 
      import 'mdbreact/dist/css/mdb.css';
Step 4.
          Now preview our created app in browser using
              $ yarn start