feat: add nxtcloud generated code

lib/Controller/ApiController.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\Nsnm\Controller;
+
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\Attribute\ApiRoute;
+use OCP\AppFramework\Http\Attribute\NoAdminRequired;
+use OCP\AppFramework\Http\DataResponse;
+use OCP\AppFramework\OCSController;
+
+/**
+ * @psalm-suppress UnusedClass
+ */
+class ApiController extends OCSController {
+	/**
+	 * An example API endpoint
+	 *
+	 * @return DataResponse<Http::STATUS_OK, array{message: string}, array{}>
+	 *
+	 * 200: Data returned
+	 */
+	#[NoAdminRequired]
+	#[ApiRoute(verb: 'GET', url: '/api')]
+	public function index(): DataResponse {
+		return new DataResponse(
+			['message' => 'Hello world!']
+		);
+	}
+}