add arizona dept of transportation api info

README.md

@@ -1187,6 +1187,7 @@ API | Description | Auth | HTTPS | CORS |
 | [AIS Hub](http://www.aishub.net/api) | Real-time data of any marine and inland vessel equipped with AIS tracking system | `apiKey` | No | Unknown |
 | [Amadeus for Developers](https://developers.amadeus.com/self-service) | Travel Search - Limited usage | `OAuth` | Yes | Unknown |
 | [apilayer aviationstack](https://aviationstack.com/) | Real-time Flight Status & Global Aviation Data API | `OAuth` | Yes | Unknown |
+| [AZ511](https://www.az511.com/developers/doc) | Access traffic data from the ADOT API | `apiKey` | Yes | Unknown |
 | [Bay Area Rapid Transit](http://api.bart.gov) | Stations and predicted arrivals for BART | `apiKey` | No | Unknown |
 | [BC Ferries](https://www.bcferriesapi.ca) | Sailing times and capacities for BC Ferries | No | Yes | Yes |
 | [BlaBlaCar](https://dev.blablacar.com) | Search car sharing trips | `apiKey` | Yes | Unknown |