updated readme

Author: konstantinPopovskikh

README.md

@@ -2,8 +2,11 @@
 
 This app is used to test the following features:
 - Google Sing In at startup;
-- "Provider Test" - basic testing of ChangeNotifier class;
-- "Future Firestore" - Fetching data from Firestore. Fetched data is cached into SQLite database;
-- "Stream Firestore" - Streaming data from Firestore. Just showing how you can add, update and delete Firestore data in real time;
-- "Clean DB" - removes all tables from SQLite database and creates them again;
-- "Old Json Caching Example" - fetching data from REST API and caching into SQLite;
+- ```Provider Test``` - basic testing of ChangeNotifier class;
+- ```Future Firestore``` - Fetching data from Firestore. Fetched data is cached into SQLite database;
+- ```Stream Firestore``` - Streaming data from Firestore. Just showing how you can add, update and delete Firestore data in real time;
+- ```Clean DB``` - removes all tables from SQLite database and creates them again;
+- ```Old Json Caching Example``` - fetching data from REST API and caching into SQLite;
+
+- Firebase notifications are also enabled. FCM token is shown in debug console at startup. Copy the token and go to "Cloud messaging" in Firebase console to test in out.
+