[General] Chandler interoperability documentation

[Mikeal Rogers]

> - One thing Morgen pointed out to me is that we don't know of any  
> CalDAV interoperability testing for Chandler Desktop in the run-up  
> to Preview. So, it might be premature to claim interoperability  
> with Apple Calendar Server/Bedework, unless someone pipes up and  
> say they've done the testing :).

We've tested against apple calendar server and bedework at every  
CalConnect interop this year with Chandler Desktop. As of the last  
interop I don't know of any blocking issues with Chandler Desktop to  
either server over CalDAV.

-Mikeal