Hello guy! today i made this amazing script!
1- create a cube
2-remove mesh renderer
3-add "Trigger" at box collider
4-add this script at the cube.
5-change the scene name

Code:

using UnityEngine;
using System.Collections;

public class LoadLevel : MonoBehaviour {

void OnTriggerEnter(Collider other) {
      AutoFade.LoadLevel("Main Menu" ,1,1,Color.black);
   }
}