Phaser 3.20 Audio Test for the following issue: phaserjs/phaser#4790

Preview of the issue: https://micsun-al.github.io/tests/phaser3-ios-audio-issue/index.html

This is based on Samme's Phaser 3 Parcel boilerplate! https://github.com/samme/phaser-parcel

** Instructions:

1. yarn install
2. yarn start