Add CoreML model conversion script & tutorial

[frederikbrammer]

Is it possible to convert the BeatNet algorithm to CoreML to use it on iOS devices? And are there any plans to add a script for CoreML conversion? I would love to see BeatNet work on-device as there really isn't any good beat tracking system for mobile devices yet.

[roimulia2]

Hey @frederikbrammer! Did you figure it out by chance?