Add usage to README

2023-08-18 17:19:37 +02:00 · 2023-08-18 17:19:37 +02:00 · d8e1711ce7
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 # Bus Departures

 Display bus departures for specific routes on specific stops.
+
+Usage:
+
+```shell
+./busdepartures[ -p=PORT]
+```
+