feat(TFARegController): Initialisiert den MVC-Controller und den View zur Bearbeitung der TFA-Registrierung.

EnvelopeGenerator.Web/Controllers/TFARegController.cs

@@ -0,0 +1,14 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace EnvelopeGenerator.Web.Controllers;
+
+//TODO: Add authorization as well as limiting the link duration (intermediate token with different role)
+[Route("tfa")]
+public class TFARegController : Controller
+{
+    [HttpGet("{key}")]
+    public IActionResult Reg(string key)
+    {
+        return View();
+    }
+}