add file on releasing the software

Change-Id: Ie7f4c93b8a38c9c69a6680c98515cebfa2474070

RELEASING.rst

@@ -0,0 +1,41 @@
+===========
+ Releasing
+===========
+
+This documents the how and when to release ``os-api-ref``.
+
+When to release
+===============
+
+Any time there are fixes or additions ready to go, they should be
+released. Releases are cheap. If it's been more than a month and there
+are changes in master, consider releasing them.
+
+If the changes are entirely on the CSS / JS cosmetic side, things are
+usually pretty safe to release as long as they have been spot checked
+against a couple of projects. (The gate does the nova tree
+automatically).
+
+If new warnings are added
+-------------------------
+
+If **new** warnings have been added since the last release, care
+should be taken to:
+
+ * Alert the mailing list 2 days before the release about the new
+   warning coming in (that should give them time to go non enforcing
+   or fix the issue).
+ * Ensure that you bump at least the Y in the version number
+ (X.Y.Z). New warnings are not a Z level release.
+
+How to release
+==============
+
+Check out ``openstack/releases``
+
+Edit ``deliverables/_independent/os-api-ref.yaml``
+
+Add a line with the version number desired, the git has of the commit
+that should be that release.
+
+If you have questions ask in ``#openstack-release``