updated README.md to include minimal example of usage

README.md

@@ -1,3 +1,39 @@
 # framerock
 
-JS framework for rad web apps
+*JS framework for rad web apps*
+
+a minimal example:
+
+```javascript
+import { async_run } from 'framerock'
+
+const jsbuild_app_frontend = async function () {
+	const str_js = `
+const on_open = function () {
+	FRAMEROCK_UTILS.transport_send_bytes('Hello from client!')
+	return
+}
+const on_message = function (data) {
+	console.log(['Client received message:', data])
+	return
+}
+FRAMEROCK_UTILS.setup_transport({ on_open, on_message })
+`.trim()
+	return str_js
+}
+
+const handle_transport_bytes = function (utils, message) {
+	console.log(['Server received message:', message])
+	utils.transport_send_bytes('Hello from server!')
+	return
+}
+
+const config = {
+	hostname: '0.0.0.0',
+	port: 8800,
+	page_title: 'framerock demo',
+}
+
+async_run({ config, jsbuild_app_frontend, handle_transport_bytes }).then(()=>{}).catch(console.error)
+```
+