adding Ganjoor, Persian Class poetry API

free and open source, the source code is available here:
https://github.com/ganjoor/GanjoorService

README.md

@@ -237,6 +237,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Bible-api](https://bible-api.com/) | Free Bible API with multiple languages | No | Yes | Yes |
 | [British National Bibliography](http://bnb.data.bl.uk/) | Books | No | No | Unknown |
 | [Crossref Metadata Search](https://github.com/CrossRef/rest-api-doc) | Books & Articles Metadata | No | Yes | Unknown |
+| [Ganjoor](https://ganjgah.ir) | Classic Persian poetry works including access to related manuscripts, recitations and music tracks | `OAuth` | Yes | Yes |
 | [Goodreads](https://www.goodreads.com/api) | Developers Access to Goodreads data | `apiKey` | Yes | Unknown |
 | [Google Books](https://developers.google.com/books/) | Books | `OAuth` | Yes | Unknown |
 | [GurbaniNow](https://github.com/GurbaniNow/api) | Fast and Accurate Gurbani RESTful API | No | Yes | Unknown |