add gitignore

INFO-3173 Mobile Development 1/Labs/Lab 4/lab-4-info-app/App.js

@@ -0,0 +1,21 @@
+import React from 'react';
+import { NavigationContainer } from '@react-navigation/native';
+import { createNativeStackNavigator } from '@react-navigation/native-stack';
+import MainScreen from './screens/MainScreen';
+import SendEmail from './screens/SendEmail';
+import SendSMS from './screens/SendSMS';
+
+const Stack = createNativeStackNavigator();
+
+export default function App() {
+  return (
+    <NavigationContainer>
+      <Stack.Navigator initialRouteName="MainScreen">
+        <Stack.Screen name="MainScreen" component={MainScreen} options={{ title: 'Lab 4 - Send My Info App' }} />
+        <Stack.Screen name="SendEmail" component={SendEmail} />
+        <Stack.Screen name="SendSMS" component={SendSMS} />
+      </Stack.Navigator>
+    </NavigationContainer>
+  );
+}
+