<!DOCTYPE html>
<html lang="en">
   <title>add user</title>
   <p><a href="/list">user and tag list</a> | <a href="/documentation">Documentation</a></p>
   <p>
    <form action="/adduser/user" method="post"><input name="username" type="search" placeholder="Username"><button>Add user</button></form>
   </p>
</html>