Add CONTRIBUTING.md

This commit adds a brief contributing guide that really links back
to the wiki page hosted on projects.puppetlabs.com. This file was
added mainly for the GitHub functionality described in this blog
post: https://github.com/blog/1184-contributing-guidelines

Author: Ryan Coleman

CONTRIBUTING.md

@@ -0,0 +1,9 @@
+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)