Move classes to models folder

app/Models/ProjectCategory.php

@@ -0,0 +1,22 @@
+<?php
+class ProjectCategory {
+    /**
+     * @var string The name of the bookmark category.
+     */
+    public $name;
+
+    /**
+     * @var array An array of Project objects.
+     */
+    public $projects;
+
+    /**
+     * BookmarkCategory constructor.
+     * @param string $name The name of the bookmark category.
+     * @param array $projects An array of Project objects.
+     */
+    public function __construct($name, $projects = array()) {
+        $this->name = $name;
+        $this->projects = $projects;
+    }
+}