Added react boilerplate tutorial

Author: sayands

README.md

@@ -150,6 +150,7 @@ To get started, simply fork this repo. Please refer to [CONTRIBUTING.md](CONTRIB
 * [Create a News App with React Native](https://medium.freecodecamp.org/create-a-news-app-using-react-native-ced249263627)
 * [Learn Webpack For React](https://medium.freecodecamp.org/learn-webpack-for-react-a36d4cac5060)
 * [Testing React App With Pupepeteer and Jest](https://blog.bitsrc.io/testing-your-react-app-with-puppeteer-and-jest-c72b3dfcde59)
+* [Build Your Own React Boilerplate](https://medium.freecodecamp.org/how-to-build-your-own-react-boilerplate-2f8cbbeb9b3f)
 
 #### Angular: