Sprinting camera movement? (C#)

I am trying to make a sprint script (C#) for my first person controller. I have the stuff that speeds up the movespeed of the controller, but I want to make it so the camera will rotate left, and right, or up and down, to simulate moving your head when running. I tried using the transform.Rotate thing, but I don’t know enough about it. Is there an easier way to move the camera? Can you show me how?

Btw, here’s my script for speeding up the controller.
using UnityEngine;
using System.Collections;

public class SprintScript : MonoBehaviour {

	// Update is called once per frame
	void Update () {
	
	 
		
		CharacterMotor Mtr = GetComponent<CharacterMotor>();

		if(Input.GetKeyDown (KeyCode.LeftShift))
		{				
	   		Mtr.movement.maxForwardSpeed = 7;
			Mtr.movement.gravity = 40;	

		}
		
		
		
		
		
		
		
		
		if(Input.GetKeyUp (KeyCode.LeftShift))
		{
			Mtr.movement.maxForwardSpeed = 2.5f;
			Mtr.movement.gravity = 40;
	    }
		
	}
}

Camera work is the hardest part of making a game IMO. Sadly, this question has been answered before…