im using openstreetmap and im making my own custom map with customized data but i dont know how do build simple routin api, maybe some can give me tips, couse im my api need to support wheelchair=“yes” property , but at the moment there are no direction service-s where that property is supported, and also if i have a linestring in geoJSON then do i have to make it for “point”-s ?(couse i want to add node-s). if somebody know some good site where is explained are that stuff how do make a routing api or something , then taht all is welcome