Add missing file '/mail/layouts/text.php' (#261)

Author: WinterSilence

mail/layouts/text.php

@@ -0,0 +1,13 @@
+<?php
+
+/** 
+ * @var yii\web\View $this view component instance
+ * @var yii\mail\BaseMessage $message the message being composed
+ * @var string $content main view render result
+ */
+
+$this->beginPage();
+$this->beginBody();
+echo $content;
+$this->endBody();
+$this->endPage();