Platform support policy proposal

There is a fair amount of confusion about the specific operating system platforms, platform versions, etc. that Chef Software, Inc. supports for its products. This RFC will clarify this by calling out the individual operating systems and their releases as explicitly supported or not.
We are moving to a place where all EL builds are done on RHEL vs CentOS (new CI uses RHEL builders). I believe @juliandunn is just documenting that aspiration.