docs(readme): add documentation

Author: hyperlink

README.md

@@ -1,4 +1,45 @@
-# elector
+# Elector - simple zookeeper based leader election
 
+[![Build Status](https://travis-ci.org/hyperlink/elector.svg?branch=master)](https://travis-ci.org/hyperlink/elector)
 [![Greenkeeper badge](https://badges.greenkeeper.io/hyperlink/elector.svg)](https://greenkeeper.io/)
-simple zookeeper based leader election
+[![npm version](https://badge.fury.io/js/elector.svg)](https://badge.fury.io/js/elector)
+
+## Features
+
+* emits `leader` event when instance has been elected a leader
+* emits `follower` event when instance is a follower
+* check using `elector.isLeader`
+
+## Install
+
+```bash
+npm install --save elector
+```
+
+## Usage
+
+```javascript
+const Elector = require('elector')
+
+const elector = new Elector({host: 'localhost:2818'})
+
+// connects to zookeeper and starts the election process
+elector.connect()
+
+elector.on('leader', function () {
+	console.log('I am the supreme leader worship me!');
+})
+
+elector.on('follower', function () {
+	console.log('I am but a lowly follower :(');
+})
+
+// leave the election and closes zookeeper connection
+elector.leave();
+
+```
+
+
+## License
+MIT
+