Add group management actions to API

src/Core/Groups/Commands/CreateGroup.php

@@ -0,0 +1,30 @@
+<?php namespace Flarum\Core\Groups\Commands;
+
+use Flarum\Core\Users\User;
+
+class CreateGroup
+{
+    /**
+     * The user performing the action.
+     *
+     * @var User
+     */
+    public $actor;
+
+    /**
+     * The attributes of the new group.
+     *
+     * @var array
+     */
+    public $data;
+
+    /**
+     * @param User $actor The user performing the action.
+     * @param array $data The attributes of the new group.
+     */
+    public function __construct(User $actor, array $data)
+    {
+        $this->actor = $actor;
+        $this->data = $data;
+    }
+}