[docs] add community chapter

doc/06-community.md

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+# Community
+
+We have a lot of people using composer, and also many contributors to the
+project.
+
+## Contributing
+
+If you would like to contribute to composer, please read the
+[README](https://github.com/composer/composer).
+
+The most important guidelines are described as follows:
+
+> All code contributions - including those of people having commit access - must
+> go through a pull request and approved by a core developer before being
+> merged. This is to ensure proper review of all the code.
+>
+> Fork the project, create a feature branch, and send us a pull request.
+
+## IRC / mailing list
+
+The developer mailing list is on [google groups](http://groups.google.com/group
+/composer-dev) IRC channels are available for discussion as well, on
+irc.freenode.org [#composer](irc://irc.freenode.org/composer) for users and
+[#composer-dev](irc://irc.freenode.org/composer-dev) for development.
+
+## Resources
+
+### Blog posts
+
+* [Composer: Part 1 – What & Why](http://nelm.io/blog/2011/12/composer-part-1-what-why/)
+* [Composer: Part 2 – Impact](http://nelm.io/blog/2011/12/composer-part-2-impact/)
+* [An Update On Composer](http://nelm.io/blog/2012/02/an-update-on-composer/)
+
+### Slides
+
+* [Dependency Management with Composer - Jordi Boggiano](http://slides.seld.be/?file=2012-02-14+Dependency+Management+with+Composer.html)
+* [Composer - Nils Adermann](http://www.slideshare.net/naderman/composer-php-usergroup-karlsruhe)