[Dune] New page 'How to Contribute'

[Oliver Sander]

Dear DUNE!
I just added a new page on how to contribute to our internet
presence.  Among other things it contains a list of possible
projects/extensions/additional modules that I find interesting,
but don't have to time to do.  Please go ahead and add your
own ideas.

--
Oliver

-- 
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* Oliver Sander                ** email: sander at mi.fu-berlin.de        *
* Freie Universität Berlin     ** phone: + 49 (30) 838 75217           *
* Institut für Mathematik      ** URL  : page.mi.fu-berlin.de/~sander  *
* Arnimallee 6                 ** -------------------------------------*
* 14195 Berlin, Germany        ** Member of MATHEON (www.matheon.de)   *
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