Merge pull request #6 from ntwb/add/contributing-md

docs: Initial `CONTRIBUTING.md` file

CONTRIBUTING.md

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+# Contributing
+
+## Workflow
+
+A good workflow is to work directly in this repo, branch off `master`, and submit your changes as a pull request.
+
+Ideally name your branches with prefixes and descriptions, like this: `[type]/[change]`. A good prefix would be:
+
+- `add/` = add a new feature
+- `try/` = experimental feature, "tentatively add"
+- `update/` = update an existing feature
+
+For example, `add/foo-module` means you're working on adding a new foo module. 
+
+You can pick among all the <a href="https://github.com/WordPress/packages/issues">tickets</a>, or some of the ones labelled <a href="https://github.com/WordPress/packages/labels/Good%20First%20Task">Good First Task</a>.