Build backend skeleton

backend/Controllers/UserController.cs

@@ -0,0 +1,17 @@
+using Microsoft.AspNetCore.Mvc;
+using Backend.Data;
+
+namespace Backend.Controllers
+{
+    [Route("v1/[controller]")]
+    [ApiController]
+    public class UserController : ControllerBase
+    {
+        private readonly IUserRepository _userRepository;
+
+        public UserController(IUserRepository userRepository)
+        {
+            _userRepository = userRepository;
+        }
+    }
+}