Add game lobby, registration, and game type pages

app/Screens/GameLobbyPage.jsx

@@ -0,0 +1,15 @@
+import React from 'react';
+import { View, Text, Button, TextInput } from 'react-native';
+
+const GameLobbyPage = () => {
+  return (
+    <View>
+      <Text>Game Lobby</Text>
+      <Button title="Create Team" onPress={() => {}} />
+      <Text>Join Team Code:</Text>
+      <TextInput placeholder="Enter Team Join Code" />
+    </View>
+  );
+};
+
+export default GameLobbyPage;