How do I add a gunshot sound to this?

I do not know how to add a audio file to this. Btw my gunshot file name is shoot.mp3 thanks

var projectile : Rigidbody;
var speed = 200;
function Update()
{
 if( Input.GetButtonDown( "Fire1" ) )
  {
  var instantiatedProjectile : Rigidbody = Instantiate( 
   projectile, transform.position, transform.rotation );
  instantiatedProjectile.velocity =
   transform.TransformDirection( Vector3( 0, 0, speed ) );
  Physics.IgnoreCollision( instantiatedProjectile. collider,
   transform.root.collider );
  }
}

Hello
If you want a simple code that does play only firing sound
here is the script

Add audiosource componenet to your gun and add your shoot.mp3 to it and add this script to your gun script which must me added to the gun model

var firing:boolean = false;
//add other variables
function Update(){
if( Input.GetButtonDown( "Fire1" ) ) {
  
//your code 
firing = true;
if(firing && !audio.IsPlaying){
audio.Play();
audio.loop = true;
}
if(!firing){

audio.Stop();

}

}
    if(!Input.GetButtonDown("Fire1")){
    firing = false;
    }
    }

Or
For more realism

var firing:boolean = false;
var clip:AudioClip;
//add other variables
function Update(){
if( Input.GetButtonDown( "Fire1" ) ) {

//your code 
firing = true;
if(firing && !audio.IsPlaying){
audio.PlayOneShot(clip);
}
 } if(!Input.GetButtonDown("Fire1")){ firing = false; } }

if you want one with reload and other sounds leave a comment

I’d go for adding an AudioSource component to the projectile prefab.
First, attach an AudioSource component to the projectile prefab in the editor. Make sure to import the sound resource as well and attach it to the audio source. Here’s a nice tutorial in unity that shows how to do that:

Then after instantiating the projectile add the following code to make it play the sound as soon as it instantiates:

var audio : AudioSource = instantiatedProjectile.GetComponent(AudioSource);
audio.loop = false;
audio.Play();

This way, since each projectile has it’s own AudioSource, there’s no problem if you shoot again while the audio from the first is still playing, you will hear the end of the first shot and also the new shot at the same time, which is realistic.