Document switching from silent audio to background location

[JJTech0130]

I was looking to implement similar funtionality in my app, and was confused because I couldn't find any code for playing audio. I then saw commit 6af8056, which changed it to background location. Could you document this in the README? Specifically, this part:

ApplicationMonitor
This class manages the lifecycle of Clip. Specifically, it is in charge of playing a silent audio clip on loop so Clip can run indefinitely in the background, as well as presenting a local notification whenever Clip stops running (for whatever reason).