Added RMV API

README.md

@@ -1206,6 +1206,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Transport for Finland](https://digitransit.fi/en/developers/ ) | Finnish transport API | No | Yes | Unknown |
 | [Transport for Germany](http://data.deutschebahn.com/dataset/api-fahrplan) | Deutsche Bahn (DB) API | `apiKey` | No | Unknown |
 | [Transport for Grenoble, France](https://www.metromobilite.fr/pages/opendata/OpenDataApi.html) | Grenoble public transport | No | No | No |
+| [Transport for Hessen, Germany](https://opendata.rmv.de/site/start.html) | RMV API (Public Transport in Hessen) | No | Yes | Unknown |
 | [Transport for Honolulu, US](http://hea.thebus.org/api_info.asp) | Honolulu Transportation Information | `apiKey` | No | Unknown |
 | [Transport for India](https://data.gov.in/sector/transport) | India Public Transport API | `apiKey` | Yes | Unknown |
 | [Transport for Lisbon, Portugal](https://emel.city-platform.com/opendata/) | Data about buses routes, parking and traffic | `apiKey` | Yes | Unknown |