How to make a "Run Stop" animation?

Hello there,

ive a basic 2D game where you control a character with idle,jump, run animations etc. They all work fine. Now i wanted to add a "Run Stop" animation like when the player is pressing left/right arrow key and then releasing it so the stop animation of the character starts.

But i dont know how to detect it. How can i say: "here you have to play the Run Stop Animation" ?.

Tryed several stuff non working. Thanks in advice

My code so far looks like this:

 public float maxSpeed = 10.0F;
 
 Animator anim;
 
 void Start(){
 
 anim = GetComponent();
 
 }
 
 void FixedUpdate(){
 
 float move = Input.GetAxis("Horizontal");
 
 //mathf abs because we do not want any negative values if we are moving 1 or -1 it just passes 1
 
 anim.SetFloat("Speed",Mathf.Abs(move));
 //just move left or right 
 //we do not need time.deltatime because we are in fixedupdate
 
 rigidbody2D.velocity = new Vector2(move * maxSpeed, rigidbody2D.velocity.y);
 
 }