adding cluster example

Author: jkyberneees

benchmark/gateway-cluster.js

@@ -0,0 +1,25 @@
+'use strict'
+
+const cluster = require('cluster')
+
+if (cluster.isMaster) {
+  const cpuCount = 4
+  for (let i = 0; i < cpuCount; i++) {
+    cluster.fork()
+  }
+} else {
+  const gateway = require('../index')
+
+  const server = gateway({
+    routes: [{
+      prefix: '/service',
+      target: 'http://127.0.0.1:3000'
+    }]
+  })
+
+  server.start(8080)
+}
+
+cluster.on('exit', (worker) => {
+  cluster.fork()
+})