Kijkwijser support in metadata API

This document describes the kijkwiser content rating support in our metadata API. Client can able to fetch the content rating information of all the programs using our metadata API.

For more details about Programs metadata see Metadata: Programs#/Programs/GetProgramIndex 

The block content_flags from the represents the content rating information per Program.

 "content_flags": [
          {
            "content_rating_authority": "fi",
            "content_rating_flag": "13",         
            "is_adult_rated": true
          }
        ],

At the time of writing this document, following values were present for property content_rating_flag from the metadata