看板初始化提交

app/Template/subtask/show.php

@@ -0,0 +1,10 @@
+<details class="accordion-section" <?= empty($subtasks) ? '' : 'open' ?>>
+    <summary class="accordion-title"><?= t('Sub-Tasks') ?></summary>
+    <div class="accordion-content">
+        <?= $this->render('subtask/table', array(
+            'subtasks' => $subtasks,
+            'task' => $task,
+            'editable' => $editable
+        )) ?>
+    </div>
+</details>