Update README.md

Author: saracope

README.md

@@ -1,6 +1,28 @@
 # code-gov-fscp-react-component
 FSCP Plugin for code-gov-web, built with Markdown and React
 
+## Install
+
+The repository is distributed with [npm](https://www.npmjs.com/). After [installing npm](https://docs.npmjs.com/getting-started/installing-node), you can install `code-gov-fscp-react-component` with this command: 
+```sh
+$ npm i @code.gov/code-gov-fscp-react-component
+```
+
+## Usage
+
+This package is meant to be used with the [code-gov-front-end](https://github.com/GSA/code-gov-front-end) project. Please follow the [configuration settings](https://github.com/GSA/code-gov-front-end/blob/master/CONFIGURATION.md#style) for the project.
+
+## Link this package to edit Code.gov styles locally
+
+You may want to view your changes in the code-gov-fscp-react-component repo on your local machine for testing. Follow these steps to do so:
+1. Clone the latest version of the `code-gov-fscp-react-component` repository.
+2. Run `npm install` to install the dependencies required for the package in the `code-gov-fscp-react-component` directory.
+3. Run `npm link` in the root level of the `code-gov-fscp-react-component` directory on your local machine.
+4. On the `code-gov-front-end` [project](https://github.com/GSA/code-gov-front-end#getting-started), clone the repository and run `npm install` if you haven’t done this already.
+5. Run `npm link @code.gov/code-gov-fscp-react-component` in the root level of the code-gov-front-end directory on your local machine.
+
+You are now using the latest version of the code.gov design system via your cloned version when running the `code-gov-front-end` site on your local machine. To stop using this version, run `npm unlink @code.gov/code-gov-fscp-react-component` from the root level of the `code-gov-front-end` directory.
+
 # References:
  - https://github.com/WhiteHouse/source-code-policy
  - https://www.whitehouse.gov/sites/whitehouse.gov/files/omb/memoranda/2016/m_16_21.pdf