Update README.md

Author: afawcett

README.md

@@ -28,6 +28,7 @@ Dreamforce Session and Slides
 - View slides for the **Dreamforce 2013** session [here](https://docs.google.com/file/d/0B6brfGow3cD8RVVYc1dCX2s0S1E/edit) 
 - Video recording of the **Dreamforce 2013** session [here](http://www.youtube.com/watch?v=qlq46AEAlLI).
 - Video recording of the **Advanced Apex Enterprise Dreamforce 2014** session [here](http://dreamforce.vidyard.com/watch/7QtP2628KmtXfmiwI-7B1w%20).
+- View slides for the **Dreamforce 2015** session [here](http://www.slideshare.net/andyinthecloud/building-strong-foundations-apex-enterprise-patterns)
 
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