help crowd-source open public transport data

[There are many JS libraries and general tools available](https://github.com/derhuerst/vbb-modules) for working with the VBB [GTFS](https://developers.google.com/transit/gtfs/) [data](https://daten.berlin.de/kategorie/verkehr). But **having *additional* (crowd-sourced) data will eventually help make public transportation in Berlin more accessible and convenient**.

A few data sets we've started collecting:

repo | description | tasks to be done
-----|-------------|-----------------
[`vbb-change-positions`](https://github.com/juliuste/vbb-change-positions) | Database of station-specific platform positions for changes between VBB metro, suburban and regional lines. | contribute more stations & lines, see [contributing](https://github.com/juliuste/vbb-change-positions#contributing)
[`vbb-osm-relations`](https://github.com/derhuerst/vbb-osm-relations) | VBB lines, platforms and station entrances and their [OSM](https://openstreetmap.org/) relations. | update the list
[`vbb-stations-with-wifi`](https://github.com/derhuerst/vbb-stations-with-wifi) | All VBB stations with free wifi. | Is the list up-to-date?
[`vbb-platform-patterns`](https://github.com/juliuste/vbb-platform-patterns) | Database of VBB station platform wall (tile) color patterns. | Contribute more stations!
[`vbb-station-photos`](https://github.com/derhuerst/vbb-station-photos) | Photos of every subway station in Berlin. | add missing stations, cover S-Bahn as well
[`vbb-common-places`](https://github.com/derhuerst/vbb-common-places) | This is a collection of **aliases for common stations** (like "zoo", "alex", "kotti") to make the search better. | add more entries
[`vbb-station-operators`](https://github.com/derhuerst/vbb-station-operators) | Which operator services a Berlin public transport station? | add more stations, e.g. in Brandenburg