Link slides for Gerrit on Kubernetes and Gardener talk

Change-Id: I293a039977f95715b9f9f2bce8f557ffe0a0a4ee

sessions/gerrit-gardener.md

diff --git a/sessions/gerrit-gardener.md b/sessions/gerrit-gardener.md
index 2d19b0e..e9593f6 100644
--- a/sessions/gerrit-gardener.md
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@@ -9,4 +9,6 @@
 We are looking for allies on this journey and think that Kubernetes has the
 potential to become the standard deployment underlay for deploying Gerrit.
 
+[Slide deck](https://speakerdeck.com/msohn/code-review-goes-cloud-native-gerrit-on-kubernetes-managed-by-gardener)
+
 *[Matthias Sohn, SAP](../speakers.md#msohn)*