docs: add prerequisites.md to documentation to outline any required steps before running BigBang

Start with steps that are needed to ensure openshift is configured properly to run.

changed milestone to %1.2.0

added kinddocs label

changed iteration to Big Bang Iterations Feb 23, 2021 - Mar 8, 2021

added to epic &24 (closed)

added BB Documentation Standards label

added 1 deleted label

removed iteration Big Bang Iterations Feb 23, 2021 - Mar 8, 2021

changed milestone to %1.3.0

changed milestone to %1.2.0

mentioned in merge request !292 (merged)

Added OpenShift configuration to prereqs doc. Marked status::review.

closed with merge request !292 (merged)

mentioned in commit 149e16ba

removed statusreview label