Adding an example for storing Audio received throu JDA as WAV file.

[DxsSucuk]

I would like to request an example for users of how they could store audio files from voicechannels.

I already worked on this feature thanks to @DV8FromTheWorld I got it working. Here would be an example of a working prototype.

[MinnDevelopment]

Audio receive will not be documented here, as it is a generally unstable and unreliable feature. Discord also does not officially support audio receive.