Add Code of Conduct and Contributing files

Standard for tier 1 RabbitMQ plugins.

References rabbitmq#33.

Author: michaelklishin

CODE_OF_CONDUCT.md

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+# Contributor Code of Conduct
+
+As contributors and maintainers of this project, and in the interest of fostering an open
+and welcoming community, we pledge to respect all people who contribute through reporting
+issues, posting feature requests, updating documentation, submitting pull requests or
+patches, and other activities.
+
+We are committed to making participation in this project a harassment-free experience for
+everyone, regardless of level of experience, gender, gender identity and expression,
+sexual orientation, disability, personal appearance, body size, race, ethnicity, age,
+religion, or nationality.
+
+Examples of unacceptable behavior by participants include:
+
+ * The use of sexualized language or imagery
+ * Personal attacks
+ * Trolling or insulting/derogatory comments
+ * Public or private harassment
+ * Publishing other's private information, such as physical or electronic addresses,
+   without explicit permission
+ * Other unethical or unprofessional conduct
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments,
+commits, code, wiki edits, issues, and other contributions that are not aligned to this
+Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors
+that they deem inappropriate, threatening, offensive, or harmful.
+
+By adopting this Code of Conduct, project maintainers commit themselves to fairly and
+consistently applying these principles to every aspect of managing this project. Project
+maintainers who do not follow or enforce the Code of Conduct may be permanently removed
+from the project team.
+
+This Code of Conduct applies both within project spaces and in public spaces when an
+individual is representing the project or its community.
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by
+contacting a project maintainer at [info@rabbitmq.com](mailto:info@rabbitmq.com). All complaints will
+be reviewed and investigated and will result in a response that is deemed necessary and
+appropriate to the circumstances. Maintainers are obligated to maintain confidentiality
+with regard to the reporter of an incident.
+
+This Code of Conduct is adapted from the
+[Contributor Covenant](http://contributor-covenant.org), version 1.3.0, available at
+[contributor-covenant.org/version/1/3/0/](http://contributor-covenant.org/version/1/3/0/)

CONTRIBUTING.md

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+## Overview
+
+RabbitMQ projects use pull requests to discuss, collaborate on and accept code contributions.
+Pull requests is the primary place of discussing code changes.
+
+## How to Contribute
+
+The process is fairly standard:
+
+ * Fork the repository or repositories you plan on contributing to
+ * Clone [RabbitMQ umbrella repository](https://github.com/rabbitmq/rabbitmq-public-umbrella)
+ * `cd umbrella`, `make co`
+ * Create a branch with a descriptive name in the relevant repositories
+ * Make your changes, run tests, commit with a [descriptive message](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html), push to your fork
+ * Submit pull requests with an explanation what has been changed and **why**
+ * Submit a filled out and signed [Contributor Agreement](https://github.com/rabbitmq/ca#how-to-submit) if needed (see below)
+ * Be patient. We will get to your pull request eventually
+
+If what you are going to work on is a substantial change, please first ask the core team
+of their opinion on [RabbitMQ mailing list](https://groups.google.com/forum/#!forum/rabbitmq-users).
+
+
+## Code of Conduct
+
+See [CODE_OF_CONDUCT.md](./CODE_OF_CONDUCT.md).
+
+
+## Contributor Agreement
+
+If you want to contribute a non-trivial change, please submit a signed copy of our
+[Contributor Agreement](https://github.com/rabbitmq/ca#how-to-submit) around the time
+you submit your pull request. This will make it much easier (in some cases, possible)
+for the RabbitMQ team at Pivotal to merge your contribution.
+
+
+## Where to Ask Questions
+
+If something isn't clear, feel free to ask on our [mailing list](https://groups.google.com/forum/#!forum/rabbitmq-users).