Add some Timed Text repos (#38)
Add some Timed Text repos (#38)

Add the following repos:

* adpt
* charter-timed-text
* tt-reqs
* ttml-webvtt-mapping
* ttml1-tests
* ttml2-tests
* ttwg
dbaron/wgmeeting-github-ircbot,dbaron/wgmeeting-github-ircbot