Getting started with the doc

[Eric Faurot]

Hi all,

I put the central GGI documentation in html/sgmldoc.
It's not yet fully functionnal. I just tried to organize
things a bit.

I also started to write chapter 2.
http://www.ggi-project.org/docs/ggibook/ggi-book.html

Fell free to correct things, add others, make better sentences...
Feedback on the diagrams would be appreciated.

Eric.