adding docs

app/code/backup/Folder.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Shikiryu\Backup\Backup;
+
+class Folder extends BackupAbstract
+{
+
+    public function __construct(array $config = array())
+    {
+        parent::__construct($config);
+
+
+    }
+
+    /**
+     * @return bool
+     */
+    public function isValid()
+    {
+        // TODO: Implement isValid() method.
+    }
+}