Add slides of Labels & Prolog-Less Submit Rules talk

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: Id9b1c32da3c6a29204a0242aff312f1efbc52aac
diff --git a/sessions/labels-and-prolog-less-submit-rules.md b/sessions/labels-and-prolog-less-submit-rules.md
index 7984533..e885e4f 100644
--- a/sessions/labels-and-prolog-less-submit-rules.md
+++ b/sessions/labels-and-prolog-less-submit-rules.md
@@ -16,4 +16,6 @@
 Prolog. I will show an example implementation of a Prolog-less submit rule and
 explain how you can develop your own custom submit rules.
 
+[Presentation slides](https://docs.google.com/presentation/d/1fUjnmngWLFaexZKlN5XmL9EmOX8Nh_P0yJcThnlJ3Lk/edit?usp=sharing)
+
 *[Edwin Kempin, Google](../speakers.md#ekempin)*