Add video & transcript for Gerrit@Google

Change-Id: Ida7826022ae6cc7447bfabceae555b267db4cab7

sessions/gerrit-at-google.md

diff --git a/sessions/gerrit-at-google.md b/sessions/gerrit-at-google.md
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 The slides for this talk can be found [here](https://docs.google.com/presentation/d/1pZkXbrhcUZxO-1TEUJgBvOiJJiYWwtHOw8fegsjvCnc).
 
+## Transcript and Recording
+
+The recording and transcript of this talk can be found [here](https://gitenterprise.me/2017/10/10/gerrit-user-summit-gerrit-at-google/)
+
 *[Patrick Hiesel, Google](../speakers.md#hiesel)*