Mobile-flash-cards 

import * as React from 'react';
import { Text, View, StyleSheet } from 'react-native';
import Constants from 'expo-constants';
import DeckList from './components/DeckList'
import DeckView from './components/DeckView'
import AddCard from './components/AddCard'

import { NavigationContainer } from '@react-navigation/native';
import { createStackNavigator } from '@react-navigation/stack';

const Stack = createStackNavigator();

export default class App extends React.Component{
  
  render(){
  return (
    <NavigationContainer>
      <Stack.Navigator initialRouteName="DeckList">
        <Stack.Screen name="DeckList" component={DeckList} />
        <Stack.Screen name="DeckView" component={DeckView} />
        <Stack.Screen name="AddCard" component={AddCard} />
      </Stack.Navigator>
    </NavigationContainer>
  )}
}