Added backend functions

src/WorkTime.Api/Controllers/AuthController.cs

@@ -0,0 +1,13 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace WorkTime.Api.Controllers;
+
+[ApiController, Route("auth")]
+public class AuthController : ControllerBase {
+
+    [HttpGet("register")]
+    public ActionResult<Guid> Register() {
+        return Ok(Guid.NewGuid().ToString());
+    }
+    
+}