Add APIKey authentication

Controllers/TodoItemsController.cs

@@ -1,24 +1,16 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
+using TodoApi.Helpers;
 using TodoApi.Models;
 
 namespace TodoApi.Controllers
 {
     [Route("api/[controller]")]
     [ApiController]
-    public class TodoItemsController : ControllerBase
+    [ApiKey]
+    public class TodoItemsController(TodoContext context) : ControllerBase
     {
-        private readonly TodoContext _context;
-
-        public TodoItemsController(TodoContext context)
-        {
-            _context = context;
-        }
+        private readonly TodoContext _context = context;
 
         // GET: api/TodoItems
         [HttpGet]