Add link to the keynote presentation

Change-Id: I4d975fe0ebd76880889acce3ed243a946b0b2970

schedule.md

diff --git a/schedule.md b/schedule.md
index 6e26de6..285f617 100644
--- a/schedule.md
+++ b/schedule.md
@@ -9,7 +9,7 @@
 | Time  | Session                                                                                      |
 |-------|----------------------------------------------------------------------------------------------|
 |  8:30 | Registration Opens, Breakfast, Networking                                                    |
-|  9:00 | Welcome introduction                                                                         |
+|  9:00 | [Welcome introduction](https://www.slideshare.net/lucamilanesio/gerrit-user-summit-2018-keynote)|
 |  9:15 | [Upgrading to Gerrit 2.15: real-life story on GerritHub](sessions/gerrithub-2.15-upgrade.md) |
 | 10:00 | [What's new in Gerrit 2.14.x and 2.15](sessions/new-in-2.14.md)                              |
 | 10:20 | [Bazel new and noteworthy](sessions/bazel-new-and-noteworthy.md)