Create CONTRIBUTING.md

Author: heapwolf

CONTRIBUTING.md

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+## This is an **OPEN Open Source Project**
+-----------------------------------------
+
+## What?
+
+Individuals making significant and valuable contributions are given commit-access to a project to contribute as they see fit. A project is more like an open wiki than a standard guarded open source project.
+
+## Rules
+
+There are a few basic ground-rules for contributors:
+
+1. **No `--force` pushes** or modifying the Git history in any way.
+2. **Non-master branches** ought to be used for ongoing work.
+3. **External API changes and significant modifications** ought to be subject to an **internal pull-request** to solicit feedback from other contributors.
+4. Internal pull-requests to solicit feedback are *encouraged* for any other non-trivial contribution but left to the discretion of the contributor.
+5. Contributors should attempt to adhere to the prevailing code-style.
+
+## Releases
+
+Declaring formal releases remains the prerogative of the project maintainer(s).
+
+## Changes to this arrangement
+
+This is an experiment and feedback is welcome! This document may also be subject to pull-requests or changes by contributors where you believe you have something valuable to add or change.
+
+This Guide was forked from [here](https://github.com/Level/community/blob/master/CONTRIBUTING.md).