added flash

app/templates/base.html

@@ -13,6 +13,12 @@
             <a href="/login">Login</a>
         </div>
         <hr>
+        {% with messages = get_flashed_messages() %}
+        {% if messages %}
+        <ul>
+            {% for message in messages %}
+            <li>{{ message }}</li>
+            {% endfor %}
         {% block content %}{% endblock %}
     </body>
-</html>
+</html>