EndScreenDed.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

public class EndScreenDed : MonoBehaviour
{
    public string mainMenu;
    public void backToMain()
    {
        SceneManager.LoadScene(mainMenu);
    }

    public void QuitGame()
    {
        Application.Quit();        
    }
}