Update README.md

README.md

@@ -1,2 +1,11 @@
 # python-service-zk
-python-service-zk
+Connect to ZK Devices, download Users and Events and send to JSON-API over HTTP
+
+usage: python-service-zk [-h] [--port PORT] [--timeout TIMEOUT] [--password PASSWORD] [--UDP | --no-UDP] [--ping | --no-ping] [--serial | --no-serial]
+         [--time | --no-time] [--users | --no-users] [--records | --no-records]
+         host URL
+
+
+* Generate event id using UNIXTime + USERId in 64bit int number
+* Add device serial, time, timeOffset to adjust timeStamps
+* Sync device time