how to correctly package a Mate keybinding

[Vojtěch Polášek <krecoun@gmail.com>]

Hello,
I am packaging an application for visually impaired and I would like to 
have a keybinding packaged with that as well, so that the app can be 
easily launched. Any idea how to do that?
I thought I would package a gsettings override, something like

```
[org/mate/desktop/keybindings/custom0]
action='lios'
binding='<Alt><Mod4>l'
name='Linux Intelligent OCR Software'
```

But what if there is already "custom0" keybinding defined?


Any guidelines about this?


Thank you,


Vojta