[Added] Pause and Game Over screens

include/services/GameService.h

@@ -0,0 +1,30 @@
+#ifndef GAME_SERVICE_H
+#define GAME_SERVICE_H
+
+#include "Service.h"
+
+class GameService : public Service<GameService> {
+public:
+    bool isPaused() {
+        return this->paused;
+    }
+
+    bool isGameOver() {
+        return this->gameOver;
+    }
+
+    void setPaused(bool paused) {
+        this->paused = paused;
+    }
+
+    void setGameOver(bool gameOver) {
+        this->gameOver = gameOver;
+    }
+
+private:
+    bool paused = false;
+    bool gameOver = false;
+};
+
+
+#endif