creating contributing.md

Adding a contributing.md file with contributing guidelines for docs on kubernetes.io (https://github.com/blog/1184-contributing-guidelines).  This should not be merged until the PR for the docs style guide is merged. (#1619)

CONTRIBUTING.md

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+# Contributing to Kubernetes Documentation
+
+**First off, thanks for taking the time to contribute!**
+
+The following is a set of guidelines for contributing to Kubernetes documentation, hosted at [Kubernetes.io](http://kubernetes.io/).
+These are just guidelines, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request.
+
+## Before you get started
+
+### Code of Conduct
+
+Kubernetes follows the [Cloud Native Computing Foundation (CNCF) Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md). By participating, you are expected to uphold this code. Please report unacceptable behavior to Sarah Novotny [sarahnovotny@google.com](mailto:sarahnovotny@google.com) and/or Dan Kohn [dan@linuxfoundation.org](mailto:dan@linuxfoundation.org). 
+
+### Documentation and Site Decisions
+
+The [Kubernetes SIG Docs Discussion Group](https://groups.google.com/forum/#!forum/kubernetes-sig-docs) is the discussion group for doc releases, suggested site improvements, and improving the doc contribution experience. If you are planning to be a regular contributor, join this group to stay informed and involved.
+
+### Style Guides and Templates
+
+Before submitting a pull request to create new content, please review the [Kubernetes.io style guide](http://kubernetes.io/docs/contribute/style-guide/) and follow the [instructions for using page templates](http://kubernetes.io/docs/contribute/page-templates/). 
+
+
+## Contributing to Documentation
+
+### Reporting Documentation Issues
+
+Kubernetes.io uses github issues to track documentation issues and requests. If you see a documentation issue, submit an issue using the following steps:
+
+1. Check the [kubernetes.io issues list](https://github.com/kubernetes/kubernetes.github.io/issues) as you might find out the issue is a duplicate. 
+2. Use the [included template for every new issue](https://github.com/kubernetes/kubernetes.github.io/issues/new).  When you create a bug report, include as many details as possible and include suggested fixes to the issue. 
+
+Note that code issues should be filed against the main kubernetes repository, while documentation issues should go in the kubernetes.io repository. 
+
+### Submitting Documentation Pull Requests
+
+If you’re fixing an issue in the existing documentation, you should submit a PR against the master branch.  Follow [these instructions to create a documentation pull request against the kubernetes.io repository](http://kubernetes.io/docs/contribute/create-pull-request/).