add initial blueprint docs

add PGaaS.rst, with "MORE TO BE ADDED"

Change-Id: I4e9349a72bd4228c50a7ef11cff9df9c96a9faa4
Signed-off-by: Tony Hansen <tony@att.com>
Issue-ID: DCAEGEN2-128

diff --git a/docs/sections/blueprints/PGaaS.rst b/docs/sections/blueprints/PGaaS.rst
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+= PostgreSQL as a Service
+
+PostgreSQL as a Service comes in two flavors: all-in-one blueprint, and
+separate disk/cluster/database blueprints to separate the management of
+the lifetime of those constituent parts. Both are provided for use.
+
+== Why Two Flavors?
+
+The reason there are two flavors of blueprints lays in the difference in
+lifetime management of the constituent parts.
+
+For example, a database usually needs to have persistent storage, which
+in these blueprints comes from Cinder storage volumes. The primitives
+used in these blueprints assume that the lifetime of the Cinder storage
+volumes matches the lifetime of the blueprint deployment. So when the
+blueprint goes away, any Cinder storage volume allocated in the
+blueprint also goes away.
+
+Similarly, a database's lifetime should have its
+
+The all-in-one blueprint assumes that everything can be allocated and
+deallocated together.
+
+MORE TO BE ADDED

diff --git a/docs/sections/blueprints/index.rst b/docs/sections/blueprints/index.rst
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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+
+Data Collection, Analytics, and Events (DCAE) blueprints
+=======================
+
+.. toctree::
+   :maxdepth: 1
+
+   ./PGaaS.rst