Make a camera follow the player as the player turns around rotate

I already can make the player rotate around y- axis by the input of the axis that has been defined on the unity editor. But I want camera also rotating while the player rotates. I already made like below, but the camera not rotating, just the player. Anyone could help me?

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4.  
5. [RequireComponent(typeof(CharacterController))] // This script requires CharacterController attached to the game object where this script attached into
6.  
7. public class CheckPlayer : MonoBehaviour
8. {
9.   private Vector3 moveDirection = Vector3.zero; // Define and set for the movement of the player is not moving by default
10.  
11.   private float gravity = 20.0f, speed = 5.0f; // Define and set for the gravity, speed of the player
12.  
13.   private void Update()
14.   {
15.   // Rotate the Player
16.   transform.Rotate(0, Input.GetAxis("Rotate") * 60.0f * Time.deltaTime, 0);
17.  
18.   Camera.main.transform.eulerAngles = new Vector3(0, Input.GetAxis("Rotate") * 60.0f * Time.deltaTime, 0);
19.  
20.   // Get the CharacterController component
21.   CharacterController controller = GetComponent<CharacterController>();
22.  
23.   // If the character is on the ground
24.   if (controller.isGrounded)
25.   {
26.   // Get the axis direction for the movement of the character from the Input in the editor
27.   moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
28.  
29.   // Player movement depends on the move direction
30.   moveDirection = transform.TransformDirection(moveDirection);
31.  
32.   // The player movement is depends on the player speed
33.   moveDirection *= speed;
34.   }
35.  
36.   // How much for the time for player takes to hit the ground because of gravity
37.   moveDirection.y -= gravity * Time.deltaTime;
38.  
39.   // Move the character each second while pressing the key input defined in the editor
40.   controller.Move(moveDirection * Time.deltaTime);
41.   }
42.  
43.   private void OnTriggerEnter(Collider col)
44.   {
45.   // If the game object colided with the certain tag
46.   if (col.gameObject.tag == "Inn's Door")
47.   {
48.   // Load another level
49.   GameManager.LoadLevel("Third Loading Scene");
50.   }
51.  
52.   // If the game object colided with the certain tag
53.   else if (col.gameObject.tag == "Field's Door")
54.   {
55.   // Load another level
56.   GameManager.LoadLevel("Fourth Loading Scene");
57.   }
58.   }
59. }
60.  
61.  

The code above I attached to the player and just refer the camera.

Thank you before