Documentation enhancement proposal

[sdaclin]

Hello,

I may be wrong but it seems that a piece of doc is missing regarding the use of the client as a consummer.
Spoiler alert I'm definitely not familiar with Node :|
I had hard time finding where you were binding the socket and finall I found in confluence this doc, so maybe it's worh adding it in the Readme.md :

const app = require('express')();
const PubSub = require('appc-pubsub');
let pubsub = new PubSub({
    key: someHexaKey,
    secret: someSecret
});
 
// Make sure JSON body parsing is done first
app.use(require('body-parser').json());
 
// Wire up the pubsub route handler to enable pubsub.on
app.post('/webhook', pubsub.handleWebhook);
 
// Listen for platform events
pubsub.on('event:com.appcelerator.platform.*', function (data) {
    console.log('Platform event received:', JSON.stringify(data, null, 4));
});
 
// Listen for billing renewal events
pubsub.on('event:com.appcelerator.billing.renew', function (data) {
    console.log('Subscription renewal event received:', JSON.stringify(data, null, 4));
});
 
app.listen(8008);