choo: add server rendering

examples/server/client.js

@@ -0,0 +1,16 @@
+const choo = require('../../')
+
+const mainView = require('./views/main')
+
+const app = choo()
+
+app.router((route) => [
+  route('/', mainView)
+])
+
+if (module.parent) {
+  module.exports = app
+} else {
+  const tree = app.start()
+  document.body.appendChild(tree)
+}