added todo

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.oidc.web/src/main/resources/en/todo.html

@@ -13,8 +13,9 @@
         <div id="content">
             <h1>to do…</h1>
             <ul>
-                <li>implement token refresh</li>
-                <li>Configuration im Frontend</li>
+              <li>implement brute-force countermeasures</li>
+	      <li>implement token refresh</li>
+              <li>Configuration im Frontend</li>
             </ul>
         </div>
     </body>