Add customer communication system

LittleShop/Controllers/AuthController.cs

@@ -0,0 +1,30 @@
+using Microsoft.AspNetCore.Mvc;
+using LittleShop.DTOs;
+using LittleShop.Services;
+
+namespace LittleShop.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+public class AuthController : ControllerBase
+{
+    private readonly IAuthService _authService;
+
+    public AuthController(IAuthService authService)
+    {
+        _authService = authService;
+    }
+
+    [HttpPost("login")]
+    public async Task<ActionResult<AuthResponseDto>> Login([FromBody] LoginDto loginDto)
+    {
+        var result = await _authService.LoginAsync(loginDto);
+        
+        if (result != null)
+        {
+            return Ok(result);
+        }
+        
+        return Unauthorized(new { message = "Invalid credentials" });
+    }
+}