if(Input.GetKey(KeyCode.W)){
      Vector3 moveDirection = new Vector3(0, 0, 2);
      transform.Translate(Speed * moveDirection * Time.deltaTime);
      transform.rotation = Quaternion.Euler(transform.rotation.x,transform.rotation.y, transform.rotation.z);
      }
     if(Input.GetKey(KeyCode.S)){
      Vector3 moveDirection = new Vector3(0, 0, -2);
      transform.Translate(Speed * moveDirection * Time.deltaTime);
      transform.rotation = Quaternion.Euler(transform.rotation.x,transform.rotation.y + 180, transform.rotation.z);
      }
     if(Input.GetKey(KeyCode.A)){
      Vector3 moveDirection = new Vector3(-2, 0, 0);
      transform.Translate(Speed * moveDirection * Time.deltaTime);
      transform.rotation = Quaternion.Euler(transform.rotation.x,transform.rotation.y - 90, transform.rotation.z);
      }
     if(Input.GetKey(KeyCode.D)){
      Vector3 moveDirection = new Vector3(2, 0, 0);
      transform.Translate(Speed * moveDirection * Time.deltaTime);
      transform.rotation = Quaternion.Euler(transform.rotation.x,transform.rotation.y + 90, transform.rotation.z);
      }