Maintaince screen added

Assets/Game/Scripts/SceneManagerHelper.cs

@@ -0,0 +1,14 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class SceneManagerHelper : MonoBehaviour
+{
+    public void CloseGame(){
+        Application.Quit();
+    }
+
+    public void LoadLevel(string sceneName){
+        LoadingScreen.instance.LoadLevel(sceneName);
+    }
+}