display success or error messages

the_works/templates/_messages.html

@@ -0,0 +1,11 @@
+<section>
+{% with messages = get_flashed_messages(with_categories=true) %}
+  {% if messages %}
+    <ul class="flashes">
+    {% for category, message in messages %}
+      <li class="{{ category }}">{{ message }}</li>
+    {% endfor %}
+    </ul>
+  {% endif %}
+{% endwith %}
+</section>