MidiCaps demo

@dorienh @elchico1990 @Dapwner @ismirsubmission198 

Hey guys,

So I have made a demo for MidiCaps dataset:

https://huggingface.co/spaces/asigalov61/LAKH-MIDI-Dataset-Search

Feel free to add it to your project README.

Any feedback or suggestions would be very much appreciated.

Sincerely,

Alex