No documentation is availible at the moment, but a nice and clean
README is soon to come.

; Installation

In your shell:

    $ cd ~/.emacs.d/packges
    $ git clone git://github.com/superbobry/io-mode.git

In your Emacs config:

    (add-to-list 'load-path "~/.emacs.d/packages/io-mode")
    (require 'io-mode)

; Thanks

Major thanks to defunkt's coffee-mode, which helped me to get over most
of the tought parts of writing a major mode.

Sources:
http://renormalist.net/Renormalist/EmacsLanguageModeCreationTutorial