Wiki has been created

[Esko Luontola]

I have now created a wiki and moved the documentation from the project
web site there, so that it can be more easily edited. I've also added
some instructions on how to get the development environment ready.
Please improve the wiki pages if you notice something missing.

The address is http://github.com/orfjackal/dimdwarf/wiki

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Esko Luontola
www.orfjackal.net