Initial Windows agent repository

OGP64/usr/share/mintty/sounds/README.md

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+This directory contains sound files for deployment as mintty bell sounds.
+
+### Mintty bell sounds ###
+
+The BOING sound
+is available on [YouTube, BOING.WAV](http://kunalsdatabase.com/ebooks/computer_ebooks/Hacking%20eBooks%20Collection/Hacking/Hacking%20Tools/Hacking%20Tools/HO2K%20v0.1.8.1/HO2K%20v0.1.8.1/).
+
+Other nice boing sounds could be extracted from
+[YouTube, Boing 0](https://www.youtube.com/watch?v=iew9op9aPLQ)
+or
+[YouTube, Boing 2](https://www.youtube.com/watch?v=d7vfbyFl5kc).
+
+Further sounds are selected from a contribution of “naknak”, with some instructions 
+[how to make bell sounds](https://github.com/mintty/mintty/issues/711#issuecomment-483074839) 
+from sound sources that may be useful to others.
+The sounds are provided under the creative commons license.
+
+Suitable Windows sounds may be `Windows Default.wav`, `Windows Ding.wav`, 
+`Windows Critical Stop.wav`, from the Windows subfolder `Media`.
+
+To deploy a sound file to be listed in the Options dialog, 
+simply copy a .wav file into the config subfolder `sounds` 
+(e.g. in `$HOME/.config/mintty` or `$APPDATA/mintty`).