Support Sonarr's Kodi(XBMC) metadata

[JeWe37]

Feature description

Ability to scan in metadata from .nfo files located alongside their corresponding media files(including images). For the format that Sonarr outputs see here. I believe this should be the only non-optional part required to permit essentially offline operation?

This would particularly be nice for people that already have a well organized Sonarr library, as it would cut any and all potential issues around correctly assigning files and wouldn't rely on a TVDB API key.

Based on a cursory look at the scanner this should be easy to implement as an additional provider, perhaps just requires a minor change to the API to provide the path to the series to the provider implementation, but beyond that should be largely non-intrusive.

[zoriya]

This would be a great addition. It should be straightforward to implement if anyone feels like it