how to rotate character controller?

I got a character controller and it's moving fine but if i press left or right i want the character to rotate. It always moves forward, backward, left or right. Can someone please help me out. Sorry if this is a noob question but i am very new to c# scripting. Thanks!

This is what i got so far:

 using UnityEngine;
 using System.Collections;
 
 
 public class MoveScript : MonoBehaviour
 {
 
     public float speed = 6.0f;
     public float jumpSpeed = 8.0f;
     public float gravity = 20.0f;
     public float jumpCount = 0.0f;
     public float turningSpeed = 60;
     
     float maxJump = 2.0f;
 
     private Vector3 moveDirection = Vector3.zero;
 
     // Update is called once per frame
     void Update()
     {
 
         CharacterController controller = GetComponent<CharacterController>();
 
         controller.Move(moveDirection * Time.deltaTime);
 
         // Apply gravity 
         moveDirection.y -= gravity * Time.deltaTime;
 
         if (!controller.isGrounded)
         {
 
             moveDirection.x = Input.GetAxis("Horizontal") * speed;
         }
 
         else
         {
             moveDirection = new Vector3(Input.GetAxis("Horizontal") * speed, 0.0f, Input.GetAxis("Vertical") * speed);
 
             jumpCount = 0.0f;
 
         }
 
 
         if (jumpCount < maxJump)
         {
             if (Input.GetButtonDown("Jump"))
             {
                 moveDirection.y = jumpSpeed;
                 jumpCount++;
             }
         }
 
         if (controller.collisionFlags == CollisionFlags.Sides)
         {
             jumpCount = 0.0f;
         }
     }
 
 }