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.
No, that is the intended actual list. It's what @adamhjk refers to as the "holy trinity of resources" but there were some complaints about that language, so I reworded it.