Add initial version of frontend

static/ws_listener.js

@@ -0,0 +1,28 @@
+let ws = new WebSocket('ws://' + document.location.host + '/ws');
+
+// ws.onopen = function() {
+//    ws.send(JSON.stringify({
+//        'anchor': '',
+//        'data': 'Hello, World!'
+//    }));
+// };
+
+// TODO: annotate objects that can fire events
+// TODO: annotate objects that should receive response from events
+// TODO: work out object notation for events that are fired
+// TODO: work out object notation for responses
+
+$('#container').on('click', '.anchor', ( function (event) {
+        let anchorName = $(this).attr('id').replace('_event', '');
+        let data = JSON.stringify({
+            'anchor': anchorName,
+            'data': $('#' + anchorName).text()
+        });
+        console.log("Sending: " + data);
+        ws.send(data);
+    }));
+
+ws.onmessage = function (messageEvent) {
+    let message = JSON.parse(messageEvent.data);
+    $('#' + message['anchor']).text(message['data']);
+};