rn doc (#611)

Author: potik1

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 API Platform Client Generator is a generator for scaffolding apps with Create-Retrieve-Update-Delete features for any API exposing a Hydra documentation. Currently the following targets are available:
 
  * React/Redux
+ * React Native
  * Vue.js
 
 The generator works especially well with APIs built with the [API Platform](https://api-platform.com) framework.

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+React Native generator
+======================
+
+Create a React Native application using [React Community's Create React Native App](https://github.com/react-community/create-react-native-app)
+
+```bash
+$ yarn add -g expo-cli
+$ expo init my-app
+$ cd my-app
+```
+
+Install:  React Native Elements, React Native Router Flux, React Native Vector Icons, Redux, React Redux, Redux Thunk, Redux Form, Prop Types
+
+```bash
+$ yarn add redux react-redux redux-thunk redux-form react-native-elements react-native-router-flux 
+react-native-vector-icons prop-types
+```
+
+Install the generator globally:
+
+```bash
+$ yarn global add @api-platform/client-generator
+```
+
+In the app directory, generate the files for the resource you want:
+
+```
+    $ generate-api-platform-client https://demo.api-platform.com  -g react-native --resource foo
+    # Replace the URL by the entrypoint of your Hydra-enabled API
+    # Omit the resource flag to generate files for all resource types exposed by the API
+```
+Create **Router.js** file to import all routes
+
+```javascript
+import React from 'react';
+import { Router, Stack } from 'react-native-router-flux';
+//replace "book" with the name of resource type
+import BookRoutes from './routes/book';
+
+const RouterComponent = () => {
+  return (
+      <Router>
+        <Stack key="root">
+          {BookRoutes}
+        </Stack>
+      </Router>
+  );
+};
+
+export default RouterComponent;
+```
+Here is an example of  **App.js**
+
+```javascript
+import React, { Component } from 'react';
+import { Provider } from 'react-redux';
+import thunk from 'redux-thunk';
+import { createStore, applyMiddleware, combineReducers} from 'redux';
+import { View } from 'react-native';
+import {reducer as form} from 'redux-form';
+//replace "book" with the name of resource type
+import book from './reducers/book';
+import Router from './Router';
+
+export default class App extends Component {
+  render() {
+    const store = createStore(combineReducers({
+      book,
+      form
+    }), {}, applyMiddleware(thunk));
+    return (
+        <Provider store={store}>
+          <View style={{flex: 1}}>
+            <Router/>
+          </View>
+        </Provider>
+    );
+  }
+}
+```
+
+The code is ready to be executed!
+```bash
+$ expo start
+```
+
+#### Example of running  application on IOS simulator
+
+![List](images/list.png) ![Show](images/item.png)
+ ![Add](images/adnew.png) ![Delete](images/del.png)