Initial commit of RabbitMQ release handling bits

Everything comes from the rabbitmq-server repository. The goals of this
move are:
    1. separate unrelated files: the broker sources and release
       handling comprising plugins;
    2. resolve an important dependency cycle: plugins depend on the
       broker to run, but the broker depends on plugins to build a
       release.

[#130659985]

1 files changed, 38 insertions, 0 deletions

diff --git a/CONTRIBUTING.md b/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).