Guidelines in development_notes.txt

[Mateusz Loskot]

Hi,

I added new doc file to the repo: development_notes.txt.
I put there notes based on the conventions and guidelines we're discussion.

Best regards,
--
Mateusz Loskot, http://mateusz.loskot.net
Charter Member of OSGeo, http://osgeo.org

[Barend Gehrels]

> I added new doc file to the repo: development_notes.txt.
> I put there notes based on the conventions and guidelines we're discussion.
>  
OK, perfect. Updated one or two lines.
Barend