Proposal: Config API design patterns as ICDNs

Hi,

I’d like to propose adopting a light-weight process for creating Config Design Notes for capturing the design patterns we want to enable in Istio (i.e. how to use namespaces, label selections, expressions etc.)
https://docs.google.com/document/d/1VWYxcAKcs6KCnghH_qMngIr20LHxA529-U_X3iuPNzk/edit?ts=5c748a86#

This is based on the API Improvement Process, internally used in Google to drive a similar process. PTAL.