title: Customize form field rendering
body: <p>I would like to customize the rendering of a form field in the edit page from  <a href="http://sonata-project.org/bundles/admin/master/doc/index.html">sonata admin bundle</a> to include an applet that uses the text content of a field.</p>
  
  <p>I know that I have to edit the <code>configureFormFields</code> function in the admin class, but I need to know 3 things:</p>
  
  <ul>
  <li>What is the syntax to provide a field form template</li>
  <li>Where to put the template file ( which directory )</li>
  <li>What the template have to looks like.</li>
  </ul>