update readme with more developer notes
update readme with more developer notes

KnockSoftware/node-osrm,KnockSoftware/node-osrm,Project-OSRM/node-osrm,Project-OSRM/node-osrm,oxidase/node-osrm,Project-OSRM/node-osrm,oxidase/node-osrm,oxidase/node-osrm,KnockSoftware/node-osrm,KnockSoftware/node-osrm