I need a script that my camera keeps spinning automatically for 2D

I just need a script for my camera that keeps spinning non stop without any inputs. It looks very simple but i just cant get a salution. Its for 2D so only z.

 

Code (CSharp):

1. public class EndlessRotator : MonoBehaviour {
2.    private void Update() {
3.       transform.Rotate(Vector3.forward);
4.    }
5. }

I'll leave it up to you to implement changing rotation speed and/or direction.