* 3.1 In your root project run 'npm start'
* 3.2 In your folder/finder, go to the root of your project ios/ => click on ProjetX.xcodeproj OR run command 'react-native run-ios'
* 3.3 Run with simulator or your iPhone from xcode
* 4.1 In your root project run 'npm start'
* 4.2 Connect your Android device to your computer (Android Studio or Android SDK is necessary)
* 4.3 Open another terminal, go to your root project and run this command 'react-native run-android'