feat(api): Implemented session closed and kick event via websocket

knockoutwhistweb/app/events/LobbyUpdateEvent.scala

@@ -0,0 +1,9 @@
+package events
+
+import de.knockoutwhist.utils.events.SimpleEvent
+
+case class LobbyUpdateEvent() extends SimpleEvent {
+
+  override def id: String = "LobbyUpdateEvent"
+  
+}