New documentation on the wiki

Hi,

I added some documentation on the about how to submit a patch.

Since I have my way of doing it. This need to be reviewed by other 
people on other platform or people using different tools and/or people 
with no account on SourceForge. (You see what I mean).....

So please take a look at:
http://opende.sourceforge.net/wiki/index.php/HOWTO_get_a_patch_checked_in

Any comments are welcome or event better any change to the wiki page.

Remi