[addresses issue #536] Added Trisquel GNU/Linux

Reasons why Trisquel must be added:

*  This distribution is targeted at people who are new to
  GNU/Linux. The installation process is simple and the default
  desktop environment reminiscent of both Windows & Mac.

*  It is endorsed (& extensively used) by the Free Software
  Foundation. Therefore it has a firm commitment to not include
  proprietary programs/software in its distribution.

*  It contains recent version of software packages in its repo (when
  compared to most other FSF endorsed distros).

*  Trisquel apparently has good hardware support. If you look at the
  [h-node hardware database][1], you'll quickly find that most of the
  hardware works with Trisquel.

Happy GNU Year 2014!

[1]: http://h-node.org/hardware/catalogue/en