Update readme: clarify Node version, shims, feature contribution policy

Readme.md

@@ -1,11 +1,21 @@
-# Status: [Maintainer Needed](https://github.com/Gozala/events/issues/43)
-
 # events [![Build Status](https://travis-ci.org/Gozala/events.png?branch=master)](https://travis-ci.org/Gozala/events)
 
-Node's event emitter for all engines.
+> Node's event emitter for all engines.
+
+This implements the Node.js [`events`](http://nodejs.org/api/events.html) module for environments that do not have it, like browsers.
+
+> `events` currently matches the **Node.js 10.1** API.
+
+Note that the `events` module uses ES5 features. If you need to support very old browsers like IE8, use a shim like [`es5-shim`](https://www.npmjs.com/package/es5-shim). You need both the shim and the sham versions of `es5-shim`.
+
+This module is maintained, but only by very few people. If you'd like to help, let us know in the [Maintainer Needed](https://github.com/Gozala/events/issues/43) issue!
 
 ## Install
 
+You usually do not have to install `events` yourself! If your code runs in Node.js, `events` is built in. If your code runs in the browser, bundlers like [browserify](https://github.com/browserify/browserify) or [webpack](https://github.com/webpack/webpack) also include the `events` module.
+
+But if none of those apply, with npm do:
+
 ```
 npm install events
 ```
@@ -14,14 +24,25 @@ npm install events
 
 ```javascript
 var EventEmitter = require('events')
-```
 
-Note that the `events` module uses ES5 features. If you need to support very old browsers like IE8, use a shim like [`es5-shim`](https://www.npmjs.com/package/es5-shim). You need both the shim and the sham versions of `es5-shim`.
+var ee = new EventEmitter()
+ee.on('message', function (text) {
+  console.log(text)
+})
+ee.emit('message', 'hello world')
+```
 
 ## API
 
 See the [Node.js EventEmitter docs](http://nodejs.org/api/events.html). `events` currently matches the Node.js 10.1 API.
 
+## Contributing
+
+PRs are very welcome! The main way to contribute to `events` is by porting features, bugfixes and tests from Node.js. Ideally, code contributions to this module are copy-pasted from Node.js and transpiled to ES5, rather than reimplemented from scratch. Matching the Node.js code as closely as possible makes maintenance simpler when new changes land in Node.js.
+This module intends to provide exactly the same API as Node.js, so features that are not available in the core `events` module will not be accepted. Feature requests should instead be directed at [nodejs/node](https://github.com/nodejs/node) and will be added to this module once they are implemented in Node.js.
+
+If there is a difference in behaviour between Node.js's `events` module and this module, please open an issue!
+
 ## License
 
 [MIT](./LICENSE)