Update README.md

README.md

@@ -6,5 +6,19 @@ ES Observable proposal implementation
 [![Coverage Status](https://coveralls.io/repos/github/bigslycat/es-observable/badge.svg?branch=master)](https://coveralls.io/github/bigslycat/es-observable?branch=master)
 [![Greenkeeper badge](https://badges.greenkeeper.io/bigslycat/es-observable.svg)](https://greenkeeper.io/)
 
+## Install
+
+`npm install --save es-observable` or `yarn add es-observable`
+
+## Usage
+
+```js
+import { Observable } from 'es-observable'
+
+Observable.of( ... )
+Observable.from( ... )
+new Observable(observer => { ... })
+```
+
 [status-url]: https://travis-ci.org/bigslycat/es-observable
 [status-img]: https://travis-ci.org/bigslycat/es-observable.svg?branch=master