Updating the readme to provide assistance for the "I can't see jekyll compose commands" issue (https://github.com/jekyll/jekyll-compose/issues/4).
Updating the readme to provide assistance for the "I can't see jekyll compose commands" issue (https://github.com/jekyll/jekyll-compose/issues/4).

Also adding a basic usage example to make clear the commands available. I initially expected I would run `jekyll compose draft "My New Draft"`

jekyll/jekyll-compose,drspaniel/jekyll-compose,drspaniel/jekyll-compose,racypepper/jekyll-compose,racypepper/jekyll-compose,AaronSikes/jekyll-compose,AaronSikes/jekyll-compose,jekyll/jekyll-compose,starrhorne/jekyll-compose,starrhorne/jekyll-compose