Apply cookiecutter to newly split project

This tempest plugin is being split out of the main keystone project in
accordance with Queens goal "Split Tempest Plugins into Separate
Repos/Projects"[1]. This patch applies the standard boilerplate files
for OpenStack projects so that it can stand on its own.

[1] https://governance.openstack.org/tc/goals/queens/split-tempest-plugins.html
diff --git a/doc/source/contributing.rst b/doc/source/contributing.rst
new file mode 100644
index 0000000..1728a61
--- /dev/null
+++ b/doc/source/contributing.rst
@@ -0,0 +1,4 @@
+============
+Contributing
+============
+.. include:: ../../CONTRIBUTING.rst