In order to play the included audio files, one has to upload the filesystem image to the esp (by using the task "Upload Filesystem Image"). (.wav should be 16 bit).
Anything else to do is configuring the pins in config.h
Code by Chris Greening (cgreening). He has slightly adapted his code especially for this case.
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Copyright (c) 2021 atomic14
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Code by Rui Santos
Rui Santos
Complete project details at https://RandomNerdTutorials.com/esp-now-esp32-arduino-ide/
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files.
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.