Added links to tutorials for integrating cra with an api backend (#1437)

* Added Rails link to User Guide

* docs: unify sections for rails and node backend integration

* docs: fix faulty link and indentation

README.md

@@ -116,7 +116,7 @@ The [User Guide](https://github.com/facebookincubator/create-react-app/blob/mast
 - [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)
 - [Can I Use Decorators?](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#can-i-use-decorators)
-- [Integrating with a Node Backend](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#integrating-with-a-node-backend)
+- [Integrating with an API Backend](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#integrating-with-an-api-backend)
 - [Proxying API Requests in Development](https://github.com/facebookincubator/create-react-app/blob/master/packages/react-scripts/template/README.md#proxying-api-requests-in-development)
 - [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)

packages/react-scripts/template/README.md

@@ -30,7 +30,9 @@ You can find the most recent version of this guide [here](https://github.com/fac
 - [Adding Flow](#adding-flow)
 - [Adding Custom Environment Variables](#adding-custom-environment-variables)
 - [Can I Use Decorators?](#can-i-use-decorators)
-- [Integrating with a Node Backend](#integrating-with-a-node-backend)
+- [Integrating with an API Backend](#integrating-with-an-api-backend)
+  - [Node](#node)
+  - [Ruby on Rails](#ruby-on-rails)
 - [Proxying API Requests in Development](#proxying-api-requests-in-development)
 - [Using HTTPS in Development](#using-https-in-development)
 - [Generating Dynamic `<meta>` Tags on the Server](#generating-dynamic-meta-tags-on-the-server)
@@ -603,9 +605,19 @@ Please refer to these two threads for reference:
 
 Create React App will add decorator support when the specification advances to a stable stage.
 
-## Integrating with a Node Backend
+## Integrating with an API Backend
 
-Check out [this tutorial](https://www.fullstackreact.com/articles/using-create-react-app-with-a-server/) for instructions on integrating an app with a Node backend running on another port, and using `fetch()` to access it. You can find the companion GitHub repository [here](https://github.com/fullstackreact/food-lookup-demo).
+These tutorials will help you to integrate your app with an API backend running on another port,
+using `fetch()` to access it.
+
+### Node
+Check out [this tutorial](https://www.fullstackreact.com/articles/using-create-react-app-with-a-server/). 
+You can find the companion GitHub repository [here](https://github.com/fullstackreact/food-lookup-demo).
+
+### Ruby on Rails
+
+Check out [this tutorial](https://www.fullstackreact.com/articles/how-to-get-create-react-app-to-work-with-your-rails-api/). 
+You can find the companion GitHub repository [here](https://github.com/fullstackreact/food-lookup-demo-rails).
 
 ## Proxying API Requests in Development