Merge pull request #38 from puppetlabs/contributing_guide

Add CONTRIBUTING.md

CONTRIBUTING.md

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+Puppet Labs modules on the Puppet Forge are open projects, and community contributions
+are essential for keeping them great. We can’t access the huge number of platforms and
+myriad of hardware, software, and deployment configurations that Puppet is intended to serve.
+
+We want to keep it as easy as possible to contribute changes so that our modules work
+in your environment. There are a few guidelines that we need contributors to follow so
+that we can have a chance of keeping on top of things.
+
+You can read the complete module contribution guide [on the Puppet Labs wiki.](http://projects.puppetlabs.com/projects/module-site/wiki/Module_contributing)