Add sound assets

These are based on sound files from Marvin Vogel, with modifications.

LICENSE

-Copyright 2021 Philipp Breuch, Dennis Baurichter
+Copyright 2021 Philipp Breuch, Dennis Baurichter and contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 

server.conf

@@ -3,10 +3,10 @@ ip = localhost
 port = 8080
 
 [buzzer]
-soundfile_closed = assets/placeholder1.wav
+soundfile_closed = assets/closed.wav
 soundfile_open = 
-soundfile_will_close = assets/placeholder2.wav
-soundfile_limbo = assets/placeholder3.wav
+soundfile_will_close = assets/will_close.wav
+soundfile_limbo = assets/limbo.wav
 
 [hdmi]
 switch_host = 192.168.1.50