Added a universal style-guide for all OS projects.
Added a universal style-guide for all OS projects.

Pursuant to a recent mailing list discussion, this file contains
the union of all style recommendations from varions openstack
projects.  The file will be removed from individual projects.

Change-Id: I79c118ff749d7c89d7d88302279ec8cb1530868d

JioCloud/oslo-incubator,JioCloud/oslo-incubator,JioCloud/oslo-incubator