README.md update

README.md

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 Websocket clock server, handling timezones, alarms and sessions.
 
+## TODO
+
+Add some test using unittest.
+
+Replace dateutil by pytz in order to implement a command listing available
+timezones.
+
+Send an array of alarms instead of 1 message per ringing alarm.
+
+Replace dirty & quick session implementation with something like werkzeug
+sessions.
+
 ## Dependencies
 
 * Python >= 3.9