title: OAuth with custom oauth provider in MVC 4
body: <p>I'm writing a simple web application in MVC 4, and I want to <a href="https://trello.com/docs/gettingstarted/oauth.html" rel="noreferrer">OAuth with Trello</a> so that I can ask a user to log-in with their trello details and then see some of their cards.</p>
  
  <p>Can anyone provide information about creating a custom oauth provider to support non-out of the box oauth providers? From what I can see, I <em>think</em> I need to create a custom Oauth provider (subclass <code>IAuthenticationClient</code> and use that) - is that right?</p>