docs: Adding the start of the contents section.

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>
diff --git a/docs/index.rst b/docs/index.rst
index 53ea8f3..bfe1dfc 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -5,6 +5,8 @@
 
     Design Rules <rules>
 
+    contents
+
     versioning
     Current Status <status>
     known_issues