Add new voice microsoft speech-api "Katja" & "Conrad"

[CodeBrauer]

See https://www.microsoft.com/cognitive-services/en-us/speech-api/documentation/API-Reference-REST/BingVoiceOutput#SupLocales to identify which language and gender it maps against. If your desired voice is not in the list of supported one, raise an issue about adding it or send me a PR.

According to your docs, raise an issue for a new Voice.

I want to use the new Voices "Katja" and "Conrad" which are german neural voices.

https://docs.microsoft.com/de-de/azure/cognitive-services/speech-service/language-support#text-to-speech