1) Copy this file somewhere in your Emacs `load-path'.  To see what
   your `load-path' is, run inside emacs: C-h v load-path<RET>

2) Add the following to your .emacs file:

   (require 'mustache-mode)

While the Mustache language can be used for any types of text,
this mode is intended for using Mustache to write HTML.