Remove unused README file in the doc directory.
Remove unused README file in the doc directory.

The doc/README.md file is obsoleted and should be removed.

Change-Id: I5e7c1713ec2acc8be76cc5449c6604a083ea51c2

stackforge/refstack,markvoelker/refstack,stackforge/refstack,openstack/refstack,openstack/refstack,markvoelker/refstack,markvoelker/refstack,stackforge/refstack,openstack/refstack,stackforge/refstack,openstack/refstack,markvoelker/refstack