Add README and base directory structure

This commit introduces the proposed layout for this repository.  The
next step after this will be to start defining the expected layout of
a spec and provide some templates.

Change-Id: I4b38d75802f3c7feef98639dfddd1898e564145f

README.rst

@@ -0,0 +1,34 @@
+==================================
+OpenStack Nova Specifications
+==================================
+
+This git repository is used to hold approved design specifications for additions
+to the Nova project.  Reviews of the specs are done in gerrit, using a similar
+workflow to how we review and merge changes to the code itself.
+
+The layout of this repository is::
+
+  <release>/
+    approved/
+    implemented/
+
+Specifications are proposed for a given release by adding it to the `approved`
+directory and posting it for review.  Once a given spec has been fully
+implemented in a release, it can be moved to the `implemented` directory.  This
+provides an easy view of what was actually implemented in a given release.  What
+remains in the `approved` directory will provide historical record of specs we
+approved but were not fully implemented.
+
+Specifications have to be re-proposed for every release.  The review may be
+quick, but even if something was previously approved, it should be re-reviewed
+to make sure it still makes sense as written.
+
+Prior to the Juno development cycle, this repository was not used for spec
+reviews.  Reviews prior to Juno were completed entirely through Launchpad
+blueprints::
+
+  http://blueprints.launchpad.net/nova
+
+For more information about working with gerrit, see::
+
+  https://wiki.openstack.org/wiki/Gerrit_Workflow