CreatePinPoint.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class CreatePinPoint : MonoBehaviour
{

    [SerializeField]
    private float distance = 20.0f;
    [SerializeField]
    private GameObject pinPoint;

    // Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButtonUp(0))
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit, distance))
            {
                Instantiate(pinPoint, hit.point,Quaternion.identity);
            }
        }
    }
}