Document native platform support and installation instructions

Author: jevakallio

README.md

@@ -2,11 +2,13 @@
 
 <p align="center">
   <a title='License' href="https://raw.githubusercontent.com/FormidableLabs/react-native-responsive-styles/master/LICENSE">
-    <img src='https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square' />
+    <img src='https://img.shields.io/badge/license-MIT-blue.svg' />
   </a>
   <a href="https://badge.fury.io/js/react-native-responsive-styles">
     <img src="https://badge.fury.io/js/react-native-responsive-styles.svg" alt="npm version" height="18">
   </a>
+  <img src='https://img.shields.io/badge/android-supported-brightgreen.svg' />
+  <img src='https://img.shields.io/badge/iOS-supported-brightgreen.svg' />
 </p>
 
 <h4 align="center">
@@ -22,6 +24,11 @@ Installation:
 npm i --save react-native-responsive-styles
 ```
 
+This library depends on [walmartlabs/react-native-orientation-listener](https://github.com/walmartlabs/react-native-orientation-listener), which contains native dependencies for iOS and Android. Link them with:
+```
+react-native link react-native-orientation-listener
+```
+
 You can now import `StyleSheet` and any React components from `react-native-responsive-styles` instead of `react-native`:
 ```js
 import {