How can i modify this script to add vertical and also horizontal camera recoil?

using System; using UnityEngine;

public class Gun : MonoBehaviour {

 public float damage = 10f;
 public float range = 100f;
 public float fireRate = 15f;
 public float impactForce = 30f;

 public Camera fpsCam;
 public ParticleSystem muzzleFlash;
 public GameObject impactEffect;

 private float nextTimeToFire = 0f;




 public static Action EventPlayerInput { get; internal set; }

  



 // Update is called once per frame
 void Update () {
     //animate recoil
     


     if (Input.GetButton("Fire1") && Time.time >= nextTimeToFire)
     {
    
         nextTimeToFire = Time.time + 1f / fireRate;
         Shoot();
     }
     
 }
 public class weaponinf
 {

 }
 void Shoot ()


 {
     muzzleFlash.Play();

     RaycastHit hit;
     if (Physics.Raycast(fpsCam.transform.position, fpsCam.transform.forward, out hit)) { }
     {
       

         Target target = hit.transform.GetComponent<Target>();
         if (target !=null)
         {
             target.TakeDamage(damage);
         }

        if (hit.rigidbody !=null)
         {
             hit.rigidbody.AddForce(-hit.normal * impactForce);
         }

         GameObject impactGO = Instantiate(impactEffect, hit.point, Quaternion.LookRotation(hit.normal));
         Destroy(impactGO, 2f);
     }
 }

}