Add readme file with installation & usage info.

Author: alrik

README.md

@@ -0,0 +1,38 @@
+# Release Notes Coding Style
+
+Extends [Airbnb JavaScript Style Guide][airbnb-js-styleguide] for use on [release-notes][release-notes] node projects.
+
+## Installation
+
+`$ npm i --save-dev @release-notes/eslint-config eslint eslint-plugin-import`
+
+And add an `.eslintrc.yml` file:
+
+```yml
+extends: '@release-notes'
+
+plugins:
+  - import
+
+env:
+  es6: true
+  node: true
+
+parserOptions:
+  sourceType: script
+```
+
+## Usage
+
+Run `npm run lint` in order to test the codebase for coding standard violations.
+
+---
+
+### LICENSE
+
+The files in this archive are released under MIT license.
+You can find a copy of this license in [LICENSE](LICENSE).
+
+
+[airbnb-js-styleguide]: https://github.com/airbnb/javascript
+[release-notes]: https://github.com/release-notes/release-notes