Created a new Expo app

screens/NotFoundScreen.tsx

@@ -0,0 +1,36 @@
+import { StyleSheet, TouchableOpacity } from 'react-native';
+
+import { Text, View } from '../components/Themed';
+import { RootStackScreenProps } from '../types';
+
+export default function NotFoundScreen({ navigation }: RootStackScreenProps<'NotFound'>) {
+  return (
+    <View style={styles.container}>
+      <Text style={styles.title}>This screen doesn't exist.</Text>
+      <TouchableOpacity onPress={() => navigation.replace('Root')} style={styles.link}>
+        <Text style={styles.linkText}>Go to home screen!</Text>
+      </TouchableOpacity>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    alignItems: 'center',
+    justifyContent: 'center',
+    padding: 20,
+  },
+  title: {
+    fontSize: 20,
+    fontWeight: 'bold',
+  },
+  link: {
+    marginTop: 15,
+    paddingVertical: 15,
+  },
+  linkText: {
+    fontSize: 14,
+    color: '#2e78b7',
+  },
+});