Add PolyGerrit UX recording and transcript

Change-Id: I3e8f7d846b94e6ed458afb7f448a790f5f1c03ca

sessions/polygerrit-ux.md

diff --git a/sessions/polygerrit-ux.md b/sessions/polygerrit-ux.md
index dc74d61..33ee5ab 100644
--- a/sessions/polygerrit-ux.md
+++ b/sessions/polygerrit-ux.md
@@ -19,3 +19,5 @@
 * [Logan Hanks, Google](../speakers.md#logan)
 
 [Slides](https://docs.google.com/presentation/d/17q-ygGioZi_5DITLyELa8oaOr22e15AHy8cq6XTZ0nY/edit?usp=sharing)
+
+[Recording and transcript](https://gitenterprise.me/2017/10/19/gerrit-user-summit-polygerrit-ux/)