Added cheatsheet for Origami, a Sublime Text package.

I can't seem to remember the keyboard shortcuts for [Origami](https://github.com/SublimeText/Origami), so I made a [Dash](http://kapeli.com/dash) [Cheatsheet](https://github.com/Kapeli/cheatsheets).


__What is Origami?__

> Origami is a new way of thinking about panes in Sublime Text 2 and 3: you tell Sublime Text where you want a new pane, and it makes one for you. It works seamlessly alongside the built-in layout commands.

Find more on [Github](https://github.com/SublimeText/Origami), or install via [Package Control](https://sublime.wbond.net/packages/Origami).