Adding the abaility to track users entering/leaving a zone in the script language.

front/src/Api/Events/EnterLeaveEvent.ts

@@ -0,0 +1,10 @@
+import * as tg from "generic-type-guard";
+
+export const isEnterLeaveEvent =
+    new tg.IsInterface().withProperties({
+        name: tg.isString,
+    }).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 EnterLeaveEvent = tg.GuardedType<typeof isEnterLeaveEvent>;