Add public view for tasks

app/Templates/task_show_description.php

@@ -0,0 +1,11 @@
+<?php if (! empty($task['description'])): ?>
+    <div id="description" class="task-show-section">
+        <div class="page-header">
+            <h2><?= t('Description') ?></h2>
+        </div>
+
+        <article class="markdown task-show-description">
+            <?= Helper\parse($task['description']) ?: t('There is no description.') ?>
+        </article>
+    </div>
+<?php endif ?>