Add links to Git and Gerrit slides

The Git and Gerrit slides explain Git and Gerrit concepts and workflows
and allow self-studying how Git and Gerrit work.

Change-Id: I27253e79cc54d97e239c5c5183eaabc1312cd7f7
Signed-off-by: Edwin Kempin <ekempin@google.com>
diff --git a/index.md b/index.md
index 3109749..d8a9792 100644
--- a/index.md
+++ b/index.md
@@ -150,3 +150,12 @@
 
 Follow us on Twitter (<a href="https://twitter.com/gerritreview">@gerritreview</a>) and
 <a href="https://plus.google.com/communities/111271594706618791655">Google+</a>.
+
+## Training Slides
+
+The following slides explain Git and Gerrit concepts and workflows and are meant
+for self-studying how Git and Gerrit work:
+
+* <a href="https://docs.google.com/presentation/d/1IQCRPHEIX-qKo7QFxsD3V62yhyGA9_5YsYXFOiBpgkk/edit?usp=sharing">Git explained: Git Concepts and Workflows</a>
+* <a href="https://docs.google.com/presentation/d/1C73UgQdzZDw0gzpaEqIC6SPujZJhqamyqO1XOHjH-uk/edit?usp=sharing">Gerrit explained: Gerrit Concepts and Workflows</a>
+