Add npm install to create react setup readme

Author: interactivellama

docs/create-react-app.md

@@ -4,16 +4,18 @@ The following tasks will help you get started using Design System React within C
 
 ## Getting Started
 
-* Create a new app
+1. Create a new app
     * `create-react-app my-react-app`
-* Copy SLDS CSS file to `public` folder
+1. Install NPM modules
+    * `npm install @salesforce-ux/design-system @salesforce/design-system-react`
+1. Copy SLDS CSS file to `public` folder
     * `/node_modules/@salesforce-ux/design-system/assets/styles/salesforce-lightning-design-system.min.css`
-* Copy SLDS icons folder to `public` folder
+1. Copy SLDS icons folder to `public` folder
     * `/node_modules/@salesforce-ux/design-system/assets/icons`
-* Add CSS file to `index.html`
+1. Add CSS file to `index.html`
     * `<link rel="stylesheet" type="text/css" href="/salesforce-lightning-design-system.min.css">`
-* Copy examples from [Design System React website](https://react.lightningdesignsystem.com/) into `app.js`.
-* Update imports to named imports (CommonJS build) of Design System React.
+1. Copy examples from [Design System React website](https://react.lightningdesignsystem.com/) into `app.js`.
+1. Update imports to named imports (CommonJS build) of Design System React.
     * `import { Button, IconSettings } from '@salesforce/design-system-react';`
-* Modify the `iconPath` prop of `IconSettings` to output the correct path to the icons in the public folder.
+1. Modify the `iconPath` prop of `IconSettings` to output the correct path to the icons in the public folder.
     * `<IconSettings iconPath="/icons">{// doc site examples}</IconSettings>`