Create CAS-PGE Documentation

For my latest software project we will be using CAS-PGE, and when I looked up documentation to explain how to setup, install and config PGE I found nothing.

To help the community collaborate and create some great documentation on this component I have started a wiki page at:

https://cwiki.apache.org/confluence/display/OODT/CAS-PGE+Help+and+Documentation

I have stared with some basic organization of the wiki, and dropped in some questions I hope to answer in the following weeks.

Once the wiki is filled in and complete enough for a Basic User Guide, this issue can be closed once the following GOALS are met.

1. A README.txt file has been created and included with the PGE components source code, for off-line documentation

2. PGE Page @ http://oodt.apache.org/components/maven/pge/ includes a link to a page for Basic User Guide Under the Software Documentation Heading like the File Manager does, for online documentation.