Add help message for private projects

app/Template/project/new.php

@@ -4,7 +4,6 @@
             <li><i class="fa fa-folder fa-fw"></i><?= $this->url->link(t('All projects'), 'project', 'index') ?></li>
         </ul>
     </div>
-    <section>
     <form method="post" action="<?= $this->url->href('project', 'save') ?>" autocomplete="off">
 
         <?= $this->form->csrf() ?>
@@ -17,5 +16,9 @@
             <?= t('or') ?> <?= $this->url->link(t('cancel'), 'project', 'index') ?>
         </div>
     </form>
-    </section>
+    <?php if (isset($is_private) && $is_private): ?>
+    <div class="alert alert-info">
+        <p><?= t('There is no user management for private projects.') ?></p>
+    </div>
+    <?php endif ?>
 </section>