Example: Allow user to add local MIDI files to the React example

[yvesgurcan]

Problem

Describe the problem related to this feature request.

I would like to be able to hear how MIDI files I have on my machine sound like with Web MIDI Player.

Please provide a code example or a URL that illustrates your problem.

Solution

What solution do you suggest to solve this problem?

The player can play MIDIs from an ArrayBuffer, so this should be doable. Not sure how if it's reasonable/doable to save the data in localStorage?