doc: add CONTRIBUTING.md

CONTRIBUTING.md

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+## Getting Started
+
+These packages are designed to make contributing as easy as possible. All work and planned features are tracked in the Issues.
+
+If you'd like to contribute **claim an existing issue** -or- **create a new issue**. All unassigned issues are up-for-grabs.
+
+Development follows the [Feature Branch Workflow][feature-workflow]:
+
+1. Fork the repo
+2. Clone your fork
+3. Create a `feat/[name]` branch
+4. Implement your feature
+5. Commit the changes
+6. Create a PR to merge the feature branch
+7. Reference the issue in the PR
+
+[feature-workflow]: https://www.atlassian.com/git/tutorials/comparing-workflows/feature-branch-workflow
+
+## Developing
+
+Open `index.html` with [Live Server][live-server] you ready to go.
+
+[live-server]: https://marketplace.visualstudio.com/items?itemName=ritwickdey.LiveServer