Add alternative schedule source format with frequencies about osm2gtfs HOT 2 OPEN

It's also worth mentioning the GTFS frequencies.txt, which is an alternative source of time information for exactly the situations described above. We should discuss whether to include the above mentioned script which processes the frequencies to our known timetable.json format (and than into stop_times.txt or to generate with the help of transitfeed this frequencies.txt.

Reasons for integrating the script:

• would be much easier to include, because the script is already working and we wouldn't need to rewrite some core functions
• frequencies.txt is optional and might not be implemented/read by all GTFS consumer programs

Reasons for generating the frequencies.txt:

• GTFS filesizes would be less big
• standardized way of giving frequencies inside GTFS

Feel free to add more arguments!

from osm2gtfs.

FYI, the Accra creator does generate a frequencies.txt file.

from osm2gtfs.