added readme for PRR process

Author: Xander Grzywinski

keps/prod-readiness/README.md

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+# Production Readiness Reviews
+
+Production readiness reviews are intended to ensure that features merging into Kubernetes are observable, scalable and supportable, can be safely operated in production environments, and can be disabled or rolled back in the event they cause increased failures in production.
+
+Production readiness reviews are done by a separate team, apart from the SIG leads (although SIG lead approval is needed as well, of course). It is useful to have the viewpoint of a team that is not as familiar with the intimate details of the SIG, but is familiar with Kubernetes and with operating Kubernetes in production. Experience through our dry runs in 1.17-1.20 have shown that this slightly "outsider" view helps identify otherwise missed items.
+
+The full documentation on the production readiness review process can be found on the SIG Architecture page [here](https://github.com/kubernetes/community/blob/master/sig-architecture/production-readiness.md)