Update README.md

Author: inokawa

README.md

@@ -1,21 +1,22 @@
 # react-native-react-bridge
 
-![check](https://github.com/inokawa/react-native-react-bridge/workflows/check/badge.svg)
+[![npm version](https://badge.fury.io/js/react-native-react-bridge.svg)](https://badge.fury.io/js/react-native-react-bridge) ![check](https://github.com/inokawa/react-native-react-bridge/workflows/check/badge.svg)
 
 An easy way to integrate your [React](https://github.com/facebook/react) app into [React Native](https://github.com/facebook/react-native) app.
 
 **This is under development**
 
 ## Install
 
-WIP
+```sh
+npm install react-native-react-bridge
+npm install react-dom react-native-webview
+```
 
-### Peer dependencies
+### Requirements
 
 - react 16.8+
 - react-native 0.60+
-- react-dom
-- react-native-webview
 
 ## Usage