draft for new issue papers

Hi Folks
I started putting some of the new issue papers on gitub in a new branch.

So far I have done a brief cover document and ported one issue paper. I
will do more when I have confirmed the style is correct

See

   - Index.html
   <https://raw.githack.com/w3c/coga/issue-papers-v2/issue-papers/index.html#sotd>
    and
   - Conversational Voice Systems
   <https://raw.githack.com/w3c/coga/issue-papers-v2/issue-papers/Conversational-Voice-Systems.html>

let me know if this is ok.
-- 
All the best

Lisa Seeman-Horwitz

LinkedIn <http://il.linkedin.com/in/lisaseeman/>, Twitter
<https://twitter.com/SeemanLisa>