Add a toc file for the plugin documentation

At Google this file is required to host the plugin documentation.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I8744b3f0530b212876cb5a254c8d46949397ad81

src/main/resources/Documentation/toc.md

diff --git a/src/main/resources/Documentation/toc.md b/src/main/resources/Documentation/toc.md
new file mode 100644
index 0000000..567f025
--- /dev/null
+++ b/src/main/resources/Documentation/toc.md
@@ -0,0 +1,4 @@
+### Admin Guides
+
+* [Configuration](config.html)
+