Create CONTRIBUTING.md

CONTRIBUTING.md

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+# How To Contribute
+
+## Submit an Issue
+
+If you are not sure how to get started with contributing, or have an issue, start by opening an [Issue](https://github.com/barrel/barrel-cli/issues).
+
+Provide enough details that will help the issue get visibility. 
+
+- **What is the main issue?**
+- **How will this help the project?**
+- **How did you run into and replicate the issue?**
+- **What systems did you run the application?**
+
+## Submit a Merge Request
+
+Feel free to fork the repo and submit merge requests for existing issues and reference the issue in the Merge Request message. A reviewer will respond to the merge request with any requirements.
+
+## Publishing
+
+We use `npm` to maintain this package. The general steps to publish will only work for users added directly to our organization.
+
+1. After the merge is successful from a given feature, bump the versions with `npm version $INC`
+2. Publish the new version to npm with `npm publish` (pre-req `npm login`)