logger docs

lib/src/logger.dart

@@ -1,3 +1,10 @@
 import 'package:logging/logging.dart';
-
+/// Logger used for the entire SDK. To output logs, configure the logger at the
+/// entry point of your app. Adjust the logger output level to your needs.
+/// A typical configuration would look like the following:
+/// 
+/// Logger.root.level = Level.FINE;
+/// Logger.root.onRecord.listen((record) {
+///   print('${record.level.name}: ${record.message}');
+/// });
 final logger = Logger('livekit');