Move Governance/PlatformCap into gerrit

At the April 8, 2015 DefCore Scale.11 meeting, the DefCore committee
decided to migrate some existing wiki artifacts into
gerrit.  This patch represents one such migration.  This patch
reproduces content previously housed at the following URL in RST
so that it can be placed more easily in source control:

https://wiki.openstack.org/wiki/Governance/PlatformCap

The following trivial formatting changes have been made to best
accommodate the new RST format:

1. The page title has been changed from the old wiki-enforced heading
   "Governance/PlatformCap" to the more plain-Englith equivalent
   "Platform Capabilities".

2. The sentence "The Defcore Committee maintains this page" has been
   removed from the top since ownership is now implied in gerrit.

3. The italics on the sentence denoting board approval have been changed
   to a callout since that's the format used on other pages being
   migrated into gerrit.

Aside from these changes, the text of the document is completely unaltered
from it's state in the wiki on the day this patch was submitted.

Change-Id: I0bde963a3c1097c9eb07f4ebd82709d455150c05

PlatformCap.rst

@@ -0,0 +1,65 @@
+=====================
+Platform Capabilities
+=====================
+
+Platform and Program Capabilities
+=================================
+
+::
+
+   The following was approved by the OpenStack Board.
+
+Extend the DefCore principles to allow for multiple levels: programs and
+platforms. Programs represent subsections of the overall platform. In some
+cases, it is acceptable for a program identified without being included in
+the platform. New programs are added at Foundation recommendation via board
+approval. Programs are added to the platform via board approval.
+
+The initial programs will be Compute & Object. The DefCore platform will
+require the Compute program, Object program and additional capabilities.
+
+Havana Approved: The Compute Program will consist of the following
+capabilities:
+
+* compute-servers
+
+* compute-volume
+
+* compute-quotas
+
+* compute-flavors
+
+* compute-auth
+
+* compute-keypairs
+
+* compute-servers-metadata
+
+* compute-floating-ips
+
+* compute-images
+
+* compute-instance-actions
+
+* compute-security-groups
+
+Havana Approved: The Object Program will consist of the following
+capabilities:
+
+* objectstore-object,
+
+* objectstore-container
+
+Havana Approved:: The Platform will consist of all the capabilities in the
+Compute and Object programs and the following capabilities:
+
+* images-v1
+
+* volume
+
+* volume-snapshots
+
+Platform and Components Illustration
+====================================
+
+.. image:: images/DefCore_Platform_and_Programs_v14.jpg