Not sure how this is supposed to become a component in Unity?

IDamageEventReciever

using UnityEngine;
using System.Collections;
//[System.Serializable]

public interface IDamageEventReciever {
  void TookDamage(int damage);
	void TookDamage(int damage, Collision col);
	void TookDamage(int damage, Collider col);
	void TookDamage(int damage, ControllerColliderHit col); 
}