title: wordpress url rewrite to add username
body: <p>I want to rewrite the url of my wordpress site in following format:</p>
  
  <p>FROM : <code>http://localhost/wp351/?user=arvind</code></p>
  
  <p>TO: <code>http://localhost/wp351/arvind</code></p>
  
  <p>Is there any way to do that?</p>