title: How to build a chrome extension to add panel to gmail windows?
body: <p>I want to build a chrome extension like <a href="http://rapportive.com/">rapportive.com</a>. I'm new to Chrome extensions and Gmail Content Script. Can any one please suggest how to go about this?</p>
  
  <p>Currently I'm reading <a href="https://developers.google.com/gadgets/docs">Google's Gadget docs</a>. </p>