Update directory structure; update with workflows

- Create CONTRIBUTING documentation
- Create LICENSE file
- Update README
- Update location of all workflows from initial directory structure to
  new workflow/ directory structure
- Delete unused, unnecessary workflows, ie - Filezilla, Source Tree,
  Sublime Text
- Update with new workflows, ie - Slackfred, iBooks Store search, iCloud
  Tabs, iTunes Store search, Mac App Store search, Safari Reading List,
  Safari/Chrome Tabs