added ubuntu trusty getting started guide

Getting Started Guide for Rocket on Ubuntu Trusty
Written in 2014 by Pivotal Software, Inc.

To the extent possible under law, the author(s) have dedicated all copyright and related and neighboring rights to this software to the public domain worldwide. This software is distributed without any warranty.
You should have received a copy of the CC0 Public Domain Dedication along with this software. If not, see [http://creativecommons.org/publicdomain/zero/1.0/](http://creativecommons.org/publicdomain/zero/1.0/)