add tokio echo server for mash

api/src/client.test.js

@@ -0,0 +1,11 @@
+const WebSocket = require('ws');
+
+const ws = new WebSocket('ws://cryps.gg:40080');
+
+ws.on('open', function open() {
+  ws.send('something else');
+});
+
+ws.on('message', function incoming(data) {
+  console.log(data);
+});