add socket.io example

examples/socket.io.js

@@ -0,0 +1,32 @@
+// First and foremost:
+// I'm not a fan of `socket.io` because it's huge and complex.
+// I much prefer `ws` because it's very simple and easy.
+// That said, it's popular.......
+'use strict';
+
+//var greenlock = require('greenlock-express');
+var greenlock = require('../');
+var options = require('./greenlock-options.js');
+var socketio = require('socket.io');
+var server;
+var io;
+
+// Any node http app will do - whether express, raw http or whatever
+options.app = require('express')().use('/', function (req, res) {
+  res.setHeader('Content-Type', 'text/html; charset=utf-8');
+  res.end('Hello, World!\n\n💚 🔒.js');
+});
+
+// The server that's handed back from `listen` is a raw https server
+server = greenlock.create(options).listen(80, 443);
+io = socketio(server);
+
+// Then you do your socket.io stuff
+io.on('connection', function (socket) {
+  console.log('a user connected');
+  socket.emit('Welcome');
+
+  socket.on('chat message', function (msg) {
+    socket.broadcast.emit('chat message', msg);
+  });
+});