Updating index with further information on how to contribute, minor adjustment to formatting on emberjs credits.

Updating index to reference Fidel, DUEL and Broke.js apps. Included descriptions. Revised intro text.

Repo: https://github.com/jupiterjs/cantodo
Commit: https://github.com/jupiterjs/cantodo/commit/65d43ec7586b0f193b2a9052a4723d286589d26a

Current version is missing edit capabilities which still need to be completed.

adding current versions of many of the applications in our backlog still being worked on for 1.0 or consideration for 1.0 as a part of labs

TodoMVC is Public Domain.