message: TrebleBoost_wApp: add link to the Play store
diff: * Created: Chip Audette, OpenAudio, August 2021
  * Purpose: Process audio by applying a high-pass filter followed by gain. Include App interaction.
  *
  +* TympanRemote App: https://play.google.com/store/apps/details?id=com.creare.tympanRemote
  +*
  * As a tutorial on how to interact with the mobile phone App, you should first explote the previous
  * example, which was "BasicGain_wApp".
  *
  