add notifications plugin + created reply comment route

public/site/plugins/notifications/index.php

@@ -0,0 +1,7 @@
+<?php
+
+Kirby::plugin('adrienpayet/pdc-notifications', [
+  'routes' => [
+    require(__DIR__ . '/routes/mark-as-read.php'),
+  ]
+]);

public/site/plugins/notifications/routes/mark-as-read.php

@@ -0,0 +1,15 @@
+<?php
+
+return [
+  'pattern' => '(:all)mark-as-read.json',
+  'method' => 'POST',
+  'action'  => function () {
+      $json = file_get_contents('php://input');
+      $data = json_decode($json);
+      $user = kirby()->user($data->userUuid);
+
+      $newNotifications = $user->readNotification($data->group, $data->notificationId);
+
+      return $newNotifications;
+  }
+];