Add CONTRIBUTING based on drivers repo.

Author: michael-simons

CONTRIBUTING.adoc

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+= Contributing to the Neo4j Ecosystem
+:sectanchors:
+
+At http://neo4j.com/[Neo4j], we develop our software in the open at
+GitHub. This provides transparency for you, our users, and allows you to
+fork the software to make your own additions and enhancements. We also
+provide areas specifically for community contributions, in particular
+the https://github.com/neo4j-contrib[neo4j-contrib] space.
+
+There's an active https://community.neo4j.com/[Neo4j Online Community]
+where we work directly with the community. If you're not already a
+member, sign up!
+
+We love our community and wouldn't be where we are without you.
+
+== Need to raise an issue?
+
+Where you raise an issue depends largely on the nature of the problem.
+
+Firstly, if you are an Enterprise customer, you might want to head over
+to our http://support.neo4j.com/[Customer Support Portal].
+
+There are plenty of public channels available too, though. If you simply
+want to get started or have a question on how to use a particular
+feature, ask a question in https://community.neo4j.com/[Neo4j Online
+Community]. If you think you might have hit a bug in our software (it
+happens occasionally!) or you have specific feature request then use the
+issue feature on the relevant GitHub repository. Check first though as
+someone else may have already raised something similar.
+
+http://stackoverflow.com/questions/tagged/neo4j[StackOverflow] also
+hosts a ton of questions and might already have a discussion around your
+problem. Make sure you have a look there too.
+
+Include as much information as you can in any request you make:
+
+* Which versions of our products are you using?
+* Which language (and which version of that language) are you developing
+with?
+* What operating system are you on?
+* Are you working with a cluster or on a single machine?
+* What code are you running?
+* What errors are you seeing?
+* What solutions have you tried already?
+
+=== Want to contribute?
+
+If you want to contribute a pull request, we have a little bit of
+process you'll need to follow:
+
+* Do all your work in a personal fork of the original repository
+* https://github.com/edx/edx-platform/wiki/How-to-Rebase-a-Pull-Request[Rebase],
+don't merge (we prefer to keep our history clean)
+* Create a branch (with a useful name) for your contribution
+* Make sure you're familiar with the appropriate coding style (this
+varies by language so ask if you're in doubt)
+* Include unit tests if appropriate (obviously not necessary for
+documentation changes)
+* Take a moment to read and sign our http://neo4j.com/developer/cla[CLA]
+
+We can't guarantee that we'll accept pull requests and may ask you to
+make some changes before they go in. Occasionally, we might also have
+logistical, commercial, or legal reasons why we can't accept your work
+but we'll try to find an alternative way for you to contribute in that
+case. Remember that many community members have become regular
+contributors and some are now even Neo employees!
+
+== Got an idea for a new project?
+
+If you have an idea for a new tool or library, start by talking to other
+people in the community. Chances are that someone has a similar idea or
+may have already started working on it. The best software comes from
+getting like minds together to solve a problem. And we'll do our best to
+help you promote and co-ordinate your Neo ecosystem projects.
+
+== Further reading
+
+If you want to find out more about how you can contribute, head over to
+our website for http://neo4j.com/developer/contributing-code/[more
+information].