Add short example

Author: leftshift

README.md

@@ -5,5 +5,12 @@ A library for fetching departures, routes and service interruptions from Munich
 ## Get it on pypi:
 `pip install mvg-api`
 
+
+Then, `import mvg_api`.
+
+To get the id for a particular Station, use something like `mvg_api.get_id_for_station("Hauptbahnhof")`.
+
+You can use this id for getting departures with `mvg_api.get_departures(6)` and use it as the start or end of a route.
+
 ## Documentation
 [Read the Documentation](http://python-mvg-departures.readthedocs.io/en/latest/?)