Add Citymapper API to Transportation

README.md

@@ -1650,6 +1650,7 @@ API | Description | Auth | HTTPS | CORS |
 | [BIC-Boxtech](https://docs.bic-boxtech.org/) | Container technical detail for the global container fleet | `OAuth` | Yes | Unknown |
 | [BlaBlaCar](https://dev.blablacar.com) | Search car sharing trips | `apiKey` | Yes | Unknown |
 | [Boston MBTA Transit](https://www.mbta.com/developers/v3-api) | Stations and predicted arrivals for MBTA | `apiKey` | Yes | Unknown |
+| [Citymapper](https://docs.external.citymapper.com/api/) | API for journey planning | `apikey` | Yes | Unknown |
 | [Community Transit](https://github.com/transitland/transitland-datastore/blob/master/README.md#api-endpoints) | Transitland API | No | Yes | Unknown |
 | [Compare Flight Prices](https://rapidapi.com/obryan-software-obryan-software-default/api/compare-flight-prices/) | API for comparing flight prices across platforms | `apiKey` | Yes | Unknown |
 | [CTS](https://api.cts-strasbourg.eu/) | CTS Realtime API | `apiKey` | Yes | Yes |