Add async/await example

examples/AsyncFunction.js

@@ -0,0 +1,33 @@
+/* SSL/non-SSL example with async/await functions */
+
+async function someAsyncTask() {
+  return 'Hey wait for me!';
+}
+
+const uWS = require('../dist/uws.js');
+const port = 9001;
+
+const app = uWS./*SSL*/App({
+  key_file_name: 'misc/key.pem',
+  cert_file_name: 'misc/cert.pem',
+  passphrase: '1234'
+}).get('/*', async (res) => {
+  /* Can't return or yield from here without responding or attaching an abort handler */
+  res.onAborted(() => {
+    res.aborted = true;
+  });
+
+  /* Awaiting will yield and effectively return to C++, so you need to have called onAborted */
+  let r = await someAsyncTask();
+
+  /* If we were aborted, you cannot respond */
+  if (!res.aborted) {
+    res.end(r);
+  }
+}).listen(port, (token) => {
+  if (token) {
+    console.log('Listening to port ' + port);
+  } else {
+    console.log('Failed to listen to port ' + port);
+  }
+});