docs(CONTRIBUTING.md)

Fixes #81
cc #105

CONTRIBUTING.md

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+# Contributing to kubernetes-client
+
+Thanks for taking the time to contribute!
+
+## Submitting an Issue
+
+We will try to respond to every issue. The issues that get the
+quickest response are the ones that are easiest to respond to. The
+issues that are easiest to respond to usually include the
+following:
+
+* A small self sufficient code example to reproduce the issue.
+* For requests for help, a small self sufficient code example that
+  illustrates what you're currently attempting to implement.
+* For API feature requests, links to supporting API documentation or
+  examples from Kubernetes clients in other languages (*e.g.*,
+  <https://github.com/kubernetes/client-go>).
+
+## Submitting a Pull Request
+
+The most useful PRs ensure the following:
+
+1. Include tests with your PR. Check out [`test/`](test)
+for adding unit tests and (possibly) integration tests. See the
+testing section in
+[README.md](https://github.com/godaddy/kubernetes-client#testing) for
+tips on running integration tests.
+1. Run `npm test` and `npm run test-integration` locally. Fix any
+issues before submitting your PR.
+1. After submitting a PR, Travis CI tests will run. Fix any issues
+Travis CI reports.
+
+## Adding new API groups
+
+The Kubernetes developers periodically add support for new API
+groups. "Core" is the most commonly used API group and includes
+fundamental resources like Pods. "Extensions" is also a commonly used
+API group that introduced Deployments. If you'd like to implement
+support for a new group you can follow this rough guide:
+
+1. Add a new API group class. See
+[`extensions.js`](https://github.com/godaddy/kubernetes-client/blob/master/lib/extensions.js)
+for an example API group class.
+1. Add resource types to your new API group class. "Group resources"
+are resources that exist outside of namespaces. Nodes is one
+example. Pods is another example that has limited support outside
+namepaces (*e.g.*, watching Pod events). "Namespace resources" are
+resources that require a namespace.
+1. Add unit tests and integration tests.
+1. Submit a PR with your changes.
+1. Add any specialized implementations of resources. See
+[`deployments.js`](https://github.com/godaddy/kubernetes-client/blob/master/lib/deployments.js)
+for an example.
+1. Submit another PR with your specialized implementations.