Add export_presets.cfg

[goatastronaut0212]

I really like your project and I would love to bring it to Nixpkgs but I notice some minor issue. It doesn't have export_presets.cfg like other projects for example https://github.com/Orama-Interactive/Pixelorama. And it make me a little bit hard to package it from source code.

I would love to know your thoughts on this. If your repo have this, it will be less work for me to do when packaging this repo in the future.

[AriaMoradi]

Take a look at #149

Creating releases changes the file each time and having the changes committed is painful and one setup doesn't work for all the developers so, we decided to not commit it at all.

[goatastronaut0212]

The one export_presets.cfg maybe annoy some people but what about the second option? I would love to have something like export_presets.cfg.linux lie somewhere in the repo though due to third option isn't that automation and packaging a binary file is not a good thing to do with non-FHS system like Guix or NixOS.