[CREATE] Code of Conduct

[ale rimoldi]

hi jon,

thanks for researching and for the links!

> http://www.python.org/psf/codeofconduct/

i specially like the python one: short, to the point and throughout
expressed in positive terms.

for what i'm concerned, we can adopt it, just by replacing python by
LGM (and some more minor changes...) and then discuss at the LGM itself
what we can add to make it even more adapted to our meeting (as an
example by adding a "In case of any problems please get in touch
with ... or ... by ...").

ciao
a.l.e