Support and Stability Policy

[Matt Caswell]

I've created a proposal for an OMC support and Stability Policy here:

https://github.com/openssl/general-policies/pull/3

This is intended to be complementary to the OTC's Stable Release 
Update's Policy currently in review here:

https://github.com/openssl/technical-policies/pull/8

The contents of the proposed policy is just existing text pulled from 
this page (with some minor editorial tweaks):

https://www.openssl.org/policies/releasestrat.html

Matt