[CentOS-docs] Introduction

Following the Contribute directions, I'm BruceHowells.

I'd like to contribute to the OpenShift page, as I'm trying to work through
bringing up OpenShift on CentOS and have found an error in the
documentation (a reference to "yum install openshift" rather than
centos-release-openshift-origin) that I'd like to correct.

I also would like to extend the existing content.
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