add a screenshot
add info.rkt for package
update README and command-line to use raco

   - install and update with raco
   - add quickstart section
add version and deps
use rackjure
close #3 add documentation for proxy + fix cache

    commit 6ed0c996f3 change the way pages are fetched. This fixes
    the cache policy of Cache-Control max-age.
close #4 : add a timeline
README: use GFM for checkboxes

The Github Flavored Markdown is now supported in README. See:
https://github.com/blog/1825-task-lists-in-all-markdown-documents