Add link to slides for PolyGerrit UX session

Change-Id: Ia71f1d8bf1d0ac4f4afc25c951e9ed39c753951b
diff --git a/sessions/polygerrit-ux.md b/sessions/polygerrit-ux.md
index 5245283..dc74d61 100644
--- a/sessions/polygerrit-ux.md
+++ b/sessions/polygerrit-ux.md
@@ -17,3 +17,5 @@
 * [Arnab Banerjee, Google](../speakers.md#arnabb)
 * [Dustin Smith, Google](../speakers.md#smithdc)
 * [Logan Hanks, Google](../speakers.md#logan)
+
+[Slides](https://docs.google.com/presentation/d/17q-ygGioZi_5DITLyELa8oaOr22e15AHy8cq6XTZ0nY/edit?usp=sharing)