Add docs for setup

[henocdz]

1. find installed shell script sudo find / -name workon.sh
2. Add to ~/.bashrc: source /usr/bin/workon.sh
3. open new terminal window
4. Enjoy!

For example:
work add project-name
work add project-name --path=/abs/path/to/project/
work add project-name /abs/path/to/project/ -- by default takes current working directory (pwd)
work list
work rm project-name
work reset -- delete all projects

[techtonik]

How is that better than virtualenvwrapper's workon ?