Example of prepending timestamp to logged messages

Added an example of automatically prepending the timestamp to all logged messages.

Author: essenciary

README.md

@@ -318,3 +318,17 @@ end
 
 global_logger(transformer_logger)
 ```
+
+## Add timestamp to all logging
+
+```
+using Logging, LoggingExtras, Dates 
+
+const date_format = "yyyy-mm-dd HH:MM:SS"
+
+timestamp_logger(logger) = TransformerLogger(logger) do log
+  merge(log, (; message = "$(Dates.format(now(), date_format)) $(log.message)"))
+end
+
+ConsoleLogger(stdout, Logging.Debug) |> timestamp_logger |> global_logger
+```