How to spawn cubes on mouse position

Hello i use this code to spawn cubes but they spawn next to the cube i attached the rigidbody so i want they to spawn on mouse position :

    using UnityEngine;
    using System.Collections;
 
  public class IfClose : MonoBehaviour {
      public bool Gravitronned;
      public Rigidbody projectile;
      // Use this for initialization
      void Start () {
  
      }
  
      // Update is called once per frame
      void Update () {
          RaycastHit hit;
          if (Input.GetKeyDown (KeyCode.F)){
              Rigidbody clone;
              clone = Instantiate(projectile, transform.position, transform.rotation) as Rigidbody;
              clone.velocity = transform.TransformDirection(Vector3.forward * 10);
              }
          }
      }