added gitignore file

FoodTracker.Api/Controllers/UserController.cs

+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace FoodTracker.Api.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class UserController : ControllerBase
+    {
+    }
+}