public class PlayerControllerScript : MonoBehaviour
{
    Animator anim;
    bool goingRight=false;

        void Start()
        {
                anim = GetComponent<Animator> ();
        }

        void Update ()
        {
                if (Input.GetKeyDown (KeyCode.D))
                {
            goingRight = true;
                        anim.SetBool("goingRight", true);
                }
                if (Input.GetKeyUp (KeyCode.D))
                {
            goingRight = false;
                        anim.SetBool("goingRight", false);
                }

        if(goingRight) transform.Translate (Vector2.right * Time.deltaTime * 5);
    }
}