title: React Native project do not have index.ios.js or index.android.js
body: <p>Hi I am newbie for React Native.
  I followed below link to build my first project but found there is no index.ios.js or index.android.js for me to edit:</p>
  
  <p><a href="https://facebook.github.io/react-native/docs/getting-started.html" rel="noreferrer">https://facebook.github.io/react-native/docs/getting-started.html</a></p>
  
  <p>Only App.js is created,
  May I know how can I edit for ios and android separately?
  Thanks!</p>