[Doc] Add a section about geocoder provider registration (Closes #32)
[Doc] Add a section about geocoder provider registration (Closes #32)

egeloen/ivory-google-map,lashus/ivory-google-map,matheusfaustino/ivory-google-map,heatery/ivory-google-map,egeloen/ivory-google-map,aGervais/ivory-google-map,yappabe/ivory-google-map,fussl/ivory-google-map