Script for jump when screen is touched (C#)

Hi Guys,

I am trying out a script for my player to jump when the screen is jumped, i am using the latest unity software and im making a 2d unity platform game.

Script

 using UnityEngine;
 using System.Collections;
 
 public class AndroidJump : MonoBehaviour {
     public bool grounded = true;
     public float jumpPower = 1;
     // Use this for initialization
     void Start () {
         
     }
     
     // Update is called once per frame
     void Update () {
 
             if(!grounded && rigidbody2D.velocity.y == 0) {
                 grounded = true;
             }
             if (Input.touchCount == 1 && grounded == true) {
                 rigidbody2D.AddForce(transform.up*jumpPower);
                 grounded = false;
             }
         }
     }