Initial layout of Designate tempest plugin

See https://review.openstack.org/283511 for history.

Change-Id: I7733e8786d6b525a7c9a8d4f12add329cd030d9d
Partially-Implements: blueprint designate-tempest-plugin
diff --git a/README.rst b/README.rst
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+================================
+Tempest Integration of Designate
+================================
+
+This directory contains Tempest tests to cover the designate project, as well
+as a plugin to automatically load these tests into tempest.
+
+See the tempest plugin docs for information on using it:
+http://docs.openstack.org/developer/tempest/plugin.html#using-plugins
+
+See the designate docs for information on writing new tests etc:
+http://docs.openstack.org/developer/designate/tempest.html
+
+Running the tests
+-----------------
+
+To run all tests from this plugin, install designate into your environment
+and from the tempest repo, run::
+
+    $ tox -e all-plugin -- designate
+
+To run a single test case, run with the test case name, for example::
+
+    $ tox -e all-plugin -- designate_tempest_plugin.tests.api.v2.test_zones.ZonesAdminTest.test_get_other_tenant_zone
+
+To run all tempest tests including this plugin, run::
+
+    $ tox -e all-plugin