Add Europeana API (#1121)

Add Europeana API (European Museums and Galleries Content)

README.md

@@ -103,6 +103,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Behance](https://www.behance.net/dev) | Design | `apiKey` | Yes | Unknown |
 | [Cooper Hewitt](https://collection.cooperhewitt.org/api) | Smithsonian Design Museum | `apiKey` | Yes | Unknown |
 | [Dribbble](http://developer.dribbble.com/v2/) | Design | `OAuth` | No | Unknown |
+| [Europeana](https://pro.europeana.eu/resources/apis/search) | European Museum and Galleries content | `apiKey` | Yes | Unknown |
 | [Harvard Art Museums](https://github.com/harvardartmuseums/api-docs) | Art | `apiKey` | No | Unknown |
 | [Iconfinder](https://developer.iconfinder.com) | Icons | `apiKey` | Yes | Unknown |
 | [Icons8](http://docs.icons8.apiary.io/#reference/0/meta) | Icons | `OAuth` | Yes | Unknown |