title: How to add sound to notification?
body: <p>How do you add sound to a notification created by NotificationCompat.Builder?
  I created a raw folder in res and added the sound there. So how do I now add it to notification? This is my Notification code</p>
  
  <pre><code>    int NOTIFY_ID=100;
      Intent notificationIntent = new Intent(this, Notification.class);
      PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_CANCEL_CURRENT);
  
      NotificationCompat.Builder mBuilder =
              new NotificationCompat.Builder(this)
              .setContentIntent(pendingIntent)
              .setSmallIcon(R.drawable.notification)
              .setContentTitle("Warning")
              .setContentText("Help!")
  
      NotificationManager mgr = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
      mgr.notify(NOTIFY_ID, mBuilder.build());
  </code></pre>