add authorization to controller

Tsi1.Api/Tsi1.Api/Controllers/SectionController.cs

-using System;
-using System.Collections.Generic;
-using System.Linq;
+using System.Collections.Generic;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Tsi1.BusinessLayer.Dtos;
+using Tsi1.BusinessLayer.Helpers;
 using Tsi1.BusinessLayer.Interfaces;
 
 namespace Tsi1.Api.Controllers
 {
+    [Authorize(Roles = UserTypes.Professor)]
     [Route("api/[controller]")]
     [ApiController]
     public class SectionController : ControllerBase