How to add a Gun Reload feature to my script

Im making an FPS Shooter but i cant find a way for the game to count the amount of times the gun has shot so i can put a limit before i have to reload please help

Script --->

  var Projectile : Rigidbody;
  var ProjectileSpeed : int = 10;
  var FireRate : float = 10;  // The number of bullets fired per second
  var lastfired : float;      // The value of Time.time at the last firing moment
  
  function Update ()
  {
      if (Input.GetButton("Fire1"))
      {
          if (Time.time - lastfired > 1 / FireRate)
          {
              lastfired = Time.time;
              var clone : Rigidbody;
              clone = Instantiate(Projectile, transform.position, transform.rotation);
              clone.velocity = transform.TransformDirection (Vector3.forward * ProjectileSpeed);
          }
      }

  }