Merge pull request #13 from kylef/patch-1

Include @ashfurrow's MVVM blog post in resources

Author: jspahrsummers

README.md

@@ -109,6 +109,7 @@ or Silverlight, but there are still a few resources that may be useful:
 **Blog posts:**
 
  * [Basic MVVM with ReactiveCocoa](http://cocoasamurai.blogspot.com/2013/03/basic-mvvm-with-reactivecocoa.html)
+ * [Model-View-ViewModel for iOS](http://www.teehanlax.com/blog/model-view-viewmodel-for-ios/)
  * [Presentation Model](http://martinfowler.com/eaaDev/PresentationModel.html)
 
 **Presentations:**