Add slides for Gerrit at Yahoo

Change-Id: If6bb58c575d46fe004a6233e368ddf1c7a6a877f

sat.md

diff --git a/sat.md b/sat.md
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@@ -115,6 +115,8 @@
 
 *Shanbin Wang, Yahoo*
 
+[Slides](https://drive.google.com/file/d/0BxQu3m7vXWQfOUc5UzljLUdLb0U/view?usp=sharing)
+
 ## 3:30 pm Git at Google
 
 *Shawn Pearce, Google*