Add GitHub templates

Author: lukebakken

.github/ISSUE_TEMPLATE.md

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+Thank you for using RabbitMQ.
+
+**STOP NOW AND READ THIS** BEFORE OPENING A NEW ISSUE ON GITHUB
+
+Unless you are CERTAIN you have found a reproducible problem in RabbitMQ or
+have a **specific, actionable** suggestion for our team, you must first ask
+your question or discuss your suspected issue on the mailing list:
+
+https://groups.google.com/forum/#!forum/rabbitmq-users
+
+Team RabbitMQ does not use GitHub issues for discussions, investigations, root
+cause analysis and so on.
+
+Please take the time to read the CONTRIBUTING.md document for instructions on
+how to effectively ask a question or report a suspected issue:
+
+https://github.com/rabbitmq/rabbitmq-server/blob/master/CONTRIBUTING.md#github-issues
+
+Following these rules **will save time** for both you and RabbitMQ's maintainers.
+
+Thank you.

.github/PULL_REQUEST_TEMPLATE.md

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+## Proposed Changes
+
+Please describe the big picture of your changes here to communicate to the
+RabbitMQ team why we should accept this pull request. If it fixes a bug or
+resolves a feature request, be sure to link to that issue.
+
+A pull request that doesn't explain **why** the change was made has a much
+lower chance of being accepted.
+
+If English isn't your first language, don't worry about it and try to
+communicate the problem you are trying to solve to the best of your abilities.
+As long as we can understand the intent, it's all good.
+
+## Types of Changes
+
+What types of changes does your code introduce to this project?
+_Put an `x` in the boxes that apply_
+
+- [ ] Bug fix (non-breaking change which fixes issue #NNNN)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause an observable behavior change in existing systems)
+- [ ] Documentation improvements (corrections, new content, etc)
+- [ ] Cosmetic change (whitespace, formatting, etc)
+
+## Checklist
+
+_Put an `x` in the boxes that apply. You can also fill these out after creating
+the PR. If you're unsure about any of them, don't hesitate to ask on the
+mailing list. We're here to help! This is simply a reminder of what we are
+going to look for before merging your code._
+
+- [ ] I have read the `CONTRIBUTING.md` document
+- [ ] I have signed the CA (see https://cla.pivotal.io/sign/rabbitmq)
+- [ ] All tests pass locally with my changes
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] I have added necessary documentation (if appropriate)
+- [ ] Any dependent changes have been merged and published in related repositories
+
+## Further Comments
+
+If this is a relatively large or complex change, kick off the discussion by
+explaining why you chose the solution you did and what alternatives you
+considered, etc.