feat: Add [Authorize] to SlidesController

Controllers/SlidesController.cs

@@ -1,3 +1,4 @@
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using NoticeBoard.Data;
@@ -5,6 +6,7 @@ using NoticeBoard.Models;
 
 namespace NoticeBoard.Controllers;
 
+[Authorize]
 public class SlidesController : Controller
 {
     private readonly AppDbContext _db;