add ColorfulClouds Weather API

README.md

@@ -958,6 +958,7 @@ API | Description | Auth | HTTPS | CORS |
 |---|---|---|---|---|
 | [7Timer!](http://www.7timer.info/doc.php?lang=en) | Weather, especially for Astroweather | No | No | Unknown |
 | [APIXU](https://www.apixu.com/doc/request.aspx) | Weather | `apiKey` | Yes | Unknown |
+| [ColorfulClouds](https://open.caiyunapp.com/ColorfulClouds_Weather_API) | Weather | `apiKey` | Yes | Yes |
 | [Dark Sky](https://darksky.net/dev/) | Weather | `apiKey` | Yes | No |
 | [MetaWeather](https://www.metaweather.com/api/) | Weather | No | Yes | No |
 | [Meteorologisk Institutt](https://api.met.no/weatherapi/documentation) | Weather and climate data | No | Yes | Unknown |