Integrate recommender related API endpoints.

[Exulansis]

Currently interactions with the agile recommender are not supported by this SDK, perhaps it could be extended, given that time and resources are available.

[Exulansis]

@SedaPolatErdeniz Perhaps you could point me to a document outlining all provided API endpoints, and I could try integrate them into the SDK. The link in the recommender README seems to be broken.