Slight UI movements

Assets/MainMenuUI/QuitGame.cs

@@ -0,0 +1,16 @@
+using UnityEngine;
+
+public class GameQuitter : MonoBehaviour
+{
+    // Method to quit the game
+    public void QuitGame()
+    {
+        // Closes the application
+        Application.Quit();
+
+        // For the editor (testing purposes), stops play mode
+        #if UNITY_EDITOR
+        UnityEditor.EditorApplication.isPlaying = false;
+        #endif
+    }
+}