[Openamp-rp] resource table specification initiative

Hello,

As discussed in last OpenAMP meeting, here is the work I started related to the creation of a specification for the resource table.

This document describes the resource table version 1, implemented in the Linux kernel and in the OpenAMP library.

My proposal would be that we start a work to release and publish a V1 spec, so that we can move towards a V2 for the evolution of the resource table.

Regards, Arnaud