change core to game

src/app/GameApplication.cpp

@@ -0,0 +1,16 @@
+#include "GameApplication.h"
+
+GameApplication::GameApplication() {
+    m_gameSession = std::make_unique<GameSession>();
+    m_inputManager = std::make_unique<InputManager>();
+
+}
+
+void GameApplication::initialize() {
+    m_gameSession->initialize();
+    
+}
+
+SDL_AppResult GameApplication::handleInputEvent(SDL_Event* event) {
+    
+}