Add: pass appID to start.html

src/game/lib/session_storage_manager.js

@@ -35,6 +35,14 @@ class SessionStorageManager {
 		return sessionStorage.getItem("playerUserID");
 	}
 
+	// playing app id
+	set playingAppID(value) {
+		sessionStorage.setItem("playingAppID", value);
+	}
+	get playingAppID() {
+		return sessionStorage.getItem("playingAppID");
+	}
+
 	// playing app name
 	set playingAppName(value) {
 		sessionStorage.setItem("playingAppName", value);