minor : loop audio bg

Assets/Scripts/MainMenu/Setting.cs

@@ -28,6 +28,7 @@ public class Setting : MonoBehaviour
     void Start()
     {
         musicSource.clip = background;
+        musicSource.loop = true;
         musicSource.Play();
         display.text = PlayerPrefs.GetString("playername");
         if (display.text == "SettingManager")