chore(readme): upload README.md

Author: 罗瑞东

README.md

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+# react-native-simple-toast
+React Native Toast component for both Android and iOS. It just let iOS have the same toast performance with Android. Using [scalessec/Toast](https://github.com/scalessec/Toast) for iOS;
+
+## Install
+You can use [rnpm](https://github.com/rnpm/rnpm) to install native component easily;
+
+```bash
+npm install react-native-simple-toast --save
+rnpm link
+```
+
+## Usage
+
+It's just the same as [ToastAndroid](http://facebook.github.io/react-native/docs/toastandroid.html)
+
+```javascript
+import Toast from 'react-native-simple-toast';
+
+Toast.show('This is a toast.');
+Toast.show('This is a long toast.',Toast.LONG);
+```