Add email notifications

app/Templates/notification_task_update.php

@@ -0,0 +1,44 @@
+<h2><?= Helper\escape($task['title']) ?> (#<?= $task['id'] ?>)</h2>
+
+<ul>
+    <li>
+        <?= dt('Created on %B %e, %Y at %k:%M %p', $task['date_creation']) ?>
+    </li>
+    <?php if ($task['date_due']): ?>
+    <li>
+        <strong><?= dt('Must be done before %B %e, %Y', $task['date_due']) ?></strong>
+    </li>
+    <?php endif ?>
+    <?php if ($task['creator_username']): ?>
+    <li>
+        <?= t('Created by %s', $task['creator_username']) ?>
+    </li>
+    <?php endif ?>
+    <li>
+        <strong>
+        <?php if ($task['assignee_username']): ?>
+            <?= t('Assigned to %s', $task['assignee_username']) ?>
+        <?php else: ?>
+            <?= t('There is nobody assigned') ?>
+        <?php endif ?>
+        </strong>
+    </li>
+    <li>
+        <?= t('Column on the board:') ?>
+        <strong><?= Helper\escape($task['column_title']) ?></strong>
+    </li>
+    <li><?= t('Task position:').' '.Helper\escape($task['position']) ?></li>
+    <?php if ($task['category_name']): ?>
+    <li>
+        <?= t('Category:') ?> <strong><?= Helper\escape($task['category_name']) ?></strong>
+    </li>
+    <?php endif ?>
+</ul>
+
+<?php if (! empty($task['description'])): ?>
+    <h2><?= t('Description') ?></h2>
+    <?= Helper\parse($task['description']) ?: t('There is no description.') ?>
+<?php endif ?>
+
+<hr/>
+<p>Kanboard</p>