Add audio

[AckerApple]

Links to self :

• audio manipulation code:
  https://mdn.github.io/webaudio-examples/stream-source-buffer/

• related audio stream extracting: https://developer.mozilla.org/en-US/docs/Web/API/AudioContext/createMediaStreamSource

Goals will be to:

• have example page with visual audio graph
• capture audio to transmit to server
• attempt to show demo server code