External Vad manifest
**Is your feature request related to a problem? Please describe.**

I have been using diarization.py example using the provided config file. The marble net vad acts really poor detecting speech. So I decided to use an External vad *( e.g pyannote vad ) to provide to the model. I could not find how to convert an external vad outputs to the manifest file required for the model

**Describe the solution you'd like**

A brief documentation on how to build the manifest file and a method to do it if possible.


