doc: add reference to Gerrit its-storyboard plugin

Change-Id: Idefa8e1197a7e5e7fada76655874373074fb740f
diff --git a/Documentation/config-plugins.txt b/Documentation/config-plugins.txt
index 608a3ac..3f84bda 100644
--- a/Documentation/config-plugins.txt
+++ b/Documentation/config-plugins.txt
@@ -342,6 +342,16 @@
 link:https://gerrit.googlesource.com/plugins/its-rtc/+doc/master/src/main/resources/Documentation/config.md[
 Configuration]
 
+[[its-storyboard]]
+==== its-storyboard
+
+Plugin to integrate with Storyboard task tracking system.
+
+link:https://gerrit-review.googlesource.com/#/admin/projects/plugins/its-storyboard[
+Project] |
+link:https://gerrit.googlesource.com/plugins/its-storyboard/+doc/master/src/main/resources/Documentation/about.md[
+Documentation]
+
 [[javamelody]]
 === javamelody