Create CONTRIBUTING.md

Author: michaelsanford

CONTRIBUTING.md

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+# CONTRIBUTING
+
+Please familiarize yourself with the [Contributor Code of Conduct](https://github.com/Node-Virtualization/node-virtualbox/blob/master/code_of_conduct.md)
+
+## Filing Issues
+
+- Please file issues using the issue templates.
+
+- Please follow the issue template exactly and provide as much meaningful detail as you can.
+
+## Testing Your Work
+
+Please test your work thoroughly before submitting a PR.
+
+Understand that Node-Virtualbox is used on a wide variety of platforms; avoid code that applies only to one host operating system and make it as generic as possible.
+
+## Submitting Pull Requests
+
+1. Pull requests *must* be tied to an issue. If no issue exists, please file one (see above).
+1. Before starting work, please claim the issue by commenting on it and letting _everyone_ know you'll be working on it. This helps prevent duplicate PRs.
+1. Please try to let us know if you abandon an issue so we can remove the `in-progress` label.
+1. Mention the issue number in a commit.
+1. Fix any issues in the automated PR checks, or explain why they're not relevant.
+
+## Code Quality Tools
+
+Checking tools are there as guidance. Use your judgement.