Created DID Spec Final Community Group Report

Per Manu's message
<https://lists.w3.org/Archives/Public/public-credentials/2019Aug/0026.html>
about next steps, I did the following:

1. Created a static copy of the DID Spec Final Community Group Report here:
https://w3c-ccg.github.io/did-spec/CGFR/2019-08-10/

I chose to name the path "CGFR" rather than "FCGS", seems the more
up-to-date convention to me, but let me know if there's any issue with that.

2. Ran the document through W3C Validators, unfortunately a few HTML and
CSS errors came up:
https://validator.w3.org/unicorn/check?ucn_uri=https%3A%2F%2Fw3c-ccg.github.io%2Fdid-spec%2FCGFR%2F2019-08-10%2F&ucn_task=conformance#

Those errors are a bit of a mystery to me, as far as I can tell their
origins are W3C tools themselves (ReSpec and stylesheets), so perhaps
it's okay to ignore them?

In that case, I think the next step is for everyone to review, and for
the W3C CCG Chairs to publish the CGFR.

Markus