Add game lobby, registration, and game type pages

app/Screens/JoinPrivateGamePage.jsx

@@ -0,0 +1,19 @@
+import React, { useState } from 'react';
+import { View, TextInput, Button } from 'react-native';
+
+const JoinPrivateGamePage = () => {
+  const [joinCode, setJoinCode] = useState('');
+
+  const handleJoinGame = () => {
+    // Logic to check join code and redirect to game lobby
+  };
+
+  return (
+    <View>
+      <TextInput placeholder="Enter Join Code" value={joinCode} onChangeText={setJoinCode} />
+      <Button title="Join Game" onPress={handleJoinGame} />
+    </View>
+  );
+};
+
+export default JoinPrivateGamePage;