Add new guide topics to README

Author: gaearon

README.md

@@ -109,6 +109,7 @@ The [User Guide](https://github.com/facebookincubator/create-react-app/blob/mast
 - [Post-Processing CSS](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#post-processing-css)
 - [Adding Images and Fonts](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#adding-images-and-fonts)
 - [Using the `public` Folder](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#using-the-public-folder)
+- [Using Global Variables](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#using-global-variables)
 - [Adding Bootstrap](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#adding-bootstrap)
 - [Adding Flow](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#adding-flow)
 - [Adding Custom Environment Variables](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#adding-custom-environment-variables)
@@ -118,6 +119,7 @@ The [User Guide](https://github.com/facebookincubator/create-react-app/blob/mast
 - [Using HTTPS in Development](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#using-https-in-development)
 - [Generating Dynamic `<meta>` Tags on the Server](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#generating-dynamic-meta-tags-on-the-server)
 - [Running Tests](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#running-tests)
+- [Developing Components in Isolation](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#developing-components-in-isolation)
 - [Deployment](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#deployment)
 
 A copy of the user guide will be created as `README.md` in your project folder.