Add ddownload (#2518)

README.md

@@ -289,6 +289,7 @@ API | Description | Auth | HTTPS | CORS |
 | [AnonFiles](https://anonfiles.com/docs/api) | Upload and share your files anonymously | No | Yes | Unknown |
 | [BayFiles](https://bayfiles.com/docs/api) | Upload and share your files | No | Yes | Unknown |
 | [Box](https://developer.box.com/) | File Sharing and Storage | `OAuth` | Yes | Unknown |
+| [ddownload](https://ddownload.com/api) | File Sharing and Storage | `apiKey` | Yes | Unknown |
 | [Dropbox](https://www.dropbox.com/developers) | File Sharing and Storage | `OAuth` | Yes | Unknown |
 | [File.io](https://www.file.io) | Super simple file sharing, convenient, anonymous and secure | No | Yes | Unknown |
 | [GoFile](https://gofile.io/api) | Unlimited size file uploads for free | `apiKey` | Yes | Unknown |