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;
         }
         
     }
 }