Add support for map-matching

[guillermodangelo]

OSRM, Valhalla and Mapbox support map-matching. The feature consists of snapping input points, such as GPS points, to the OSM network.

[nilsnolde]

Jep, that's indeed still missing for the most part. Note, that Valhalla has one version of map matching implemented. It's quite easy but still a lot of work. Are you interested in contributing?