Describe Storyboard in more detail

Include expanded content from the webclient About page to explain the
motivation for the creation of Storyboard.

Change-Id: Idd06b19ff141720b0a22f8dd29098c9520c54f1b

README.rst

@@ -1,7 +1,11 @@
 Storyboard
 ==========
 
-Storyboard is a task tracker for OpenStack.
+Storyboard is a task tracker created to serve the needs of highly-distributed
+systems that span multiple projects, to enable cross-project work on a massive
+scale.  Concepts were adapted from existing tools, and as many potential points
+of contention were removed as possible, to better facilitate coordination of
+project work by stakeholders with widely varied interests and needs.
 
 
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