RAD bot

Based on https://stackoverflow.com/questions/20769261/how-to-get-video-elements-current-level-of-loudness

References: https://developer.mozilla.org/en-US/docs/Web/API/AudioContext

https://developer.mozilla.org/en-US/docs/Web/API/AudioContext/createMediaElementSource

https://developer.mozilla.org/en-US/docs/Web/API/HTMLVideoElement