Add intro explaining embedding React in existing app

docs/EmbeddedApp.md

@@ -7,7 +7,14 @@ permalink: docs/embeded-app.html
 next: activityindicatorios
 ---
 
-## Install React Native Using CocoaPods
+Since React makes no assumptions about the rest of your technology stack – it’s commonly noted as simply the `V` in `MVC` – it’s easily embeddable within an existing non-React Native app. In fact, it integrates with other best practice community tools like [Cocoapods](http://cocoapods.org/).
+
+## Requirements
+
+- [Cocoapods](http://cocoapods.org/) – `gem install cocoapods`
+- [Node.js](http://nodejs.org) – `brew install node`
+
+## Install React Native Using Cocoapods
 
 [CocoaPods](http://cocoapods.org/) is a package management tool for iOS/Mac development. We need to use it to download React Native. If you haven't install CocoaPods yet, checkout [this tutorial](http://guides.cocoapods.org/using/getting-started.html).
 
@@ -27,8 +34,6 @@ Then install pods via shell
 $ pod install --verbose
 ```
 
-The installation process also requires [Node.js](http://nodejs.org).
-
 ## Create Your React Native App
 
 First, enter React Native's pod root directory and create **index.ios.js** inside a directory `ReactComponent`.