game state can be read out by the client APIs

# Conflicts:
#	front/src/Api/IframeListener.ts
#	front/src/Phaser/Game/GameScene.ts
#	front/src/iframe_api.ts

front/src/Api/Events/ApiGameStateEvent.ts

@@ -0,0 +1,11 @@
+import * as tg from "generic-type-guard";
+
+export const isGameStateEvent =
+    new tg.IsInterface().withProperties({
+        roomId: tg.isString,
+        data:tg.isObject
+    }).get();
+/**
+ * A message sent from the game to the iFrame when a user enters or leaves a zone marked with the "zone" property.
+ */
+export type GameStateEvent = tg.GuardedType<typeof isGameStateEvent>;