Support getting directions via openrouteservice

[ParetoOptimalDev]

Today I wanted to use osm.el to get directions from one place to another, but realized there wasn't support.

I realized why and searched to see if there were open source solutions and there is openrouteservice, a free directions REST API compatible with OpenStreetMap which crowd sources directions.

Here is the API:

https://openrouteservice.org/dev/#/api-docs/v2/directions

I'm not sure if you are interested or have a need, but it seems like a fun/useful addition 😄