The tools directory has been moved to a separate
repository openstack-doc-tools:

https://github.com/openstack/openstack-doc-tools

Please do not make changes here, commit instead to openstack-doc-tools
unless you need those for gating jobs.

This directory will be removed once all the gating jobs are setup
correctly.

Add README for tools directory
Add README for tools directory

Explain openstack-doc-tools repository

Change-Id: I19bd374560e7f89a3dc4eff3944b61a0468299d3
