Add Covid-19 Datenhub (#2454)

README.md

@@ -903,6 +903,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Covid Tracking Project](https://covidtracking.com/data/api/version-2) | Covid-19  data for the US | No | Yes | No |
 | [Covid-19](https://covid19api.com/) | Covid 19 spread, infection and recovery | No | Yes | Yes |
 | [Covid-19](https://github.com/M-Media-Group/Covid-19-API) | Covid 19 cases, deaths and recovery per country | No | Yes | Yes |
+| [Covid-19 Datenhub](https://npgeo-corona-npgeo-de.hub.arcgis.com) | Maps, datasets, applications and more in the context of COVID-19 | No | Yes | Unknown |
 | [Covid-19 Government Response](https://covidtracker.bsg.ox.ac.uk) | Government measures tracker to fight against the Covid-19 pandemic | No | Yes | Yes |
 | [Covid-19 JHU CSSE](https://nuttaphat.com/covid19-api/) | Open-source API for exploring Covid19 cases based on JHU CSSE | No | Yes | Yes |
 | [Covid-19 Live Data](https://github.com/mathdroid/covid-19-api) | Global and countrywise data of Covid 19 daily Summary, confirmed cases, recovered and deaths | No | Yes | Yes |