To help communicate the purpose of the repo, how to use it, and details
around its structure, I've created a README explain those key points.
I am only adding it to the main branch since the test branch does not
need that documentation since the test branch, by design, is free of
restrictions.
As part of setting-up the "external" repo to store SCP licenses in, I am
adding the current SCP license.
This repo is placed under widevine-partners so that the Kokoro bot can
access it since it does not have corp access when running.
