added basic user registration api

backend/app/Http/Controllers/UserController.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\User;
+use Exception;
+use Illuminate\Http\Request;
+use Illuminate\Http\Response;
+use Ramsey\Uuid\Uuid;
+use Throwable;
+
+class UserController extends Controller
+{
+    public function create(Request $request): Response
+    {
+        $user = new User();
+        $user->fill([
+            'firstname' => $request->get('firstname'),
+            'lastname' => $request->get('lastname'),
+            'birthday' => $request->get('birthday'),
+            'telephone' => $request->get('telephone'),
+            'username' => $request->get('username'),
+            'playertype' => $request->get('playertype'),
+            'password' => $request->get('password'),
+        ]);
+
+        $user->uuid = Uuid::uuid4();
+
+        try {
+            $user->saveOrFail();
+        } catch (Throwable $e) {
+            return response(["error" => $e->getMessage()], 500);
+        }
+
+        return response($user);
+    }
+}