text: import React from 'react'
  import { StyleSheet, Platform, Image, Text, View } from 'react-native'
  import { SwitchNavigator } from 'react-navigation'
  
  // import the different screens
  import Loading from './Loading'
  import SignUp from './SignUp'
  import Login from './Login'
  import Main from './Main'
  
  // create our app's navigation stack
  const App = SwitchNavigator(
    {
      Loading,
      SignUp,
      Login,
      Main
    },
    {
      initialRouteName: 'Loading'
    }
  )
  
  export default App
  