Documentation: Keyboard Events about relm4 HOT 2 OPEN

@AaronErhardt, this is exactly what I'm looking for thank you! I can certainly get started on what I'm working on with this, so that's all I need.

I'm going to leave the issue open in case its of any use for a project tracker or anything but if you'd prefer to resolve it then feel free to close. Appreciate the response :)

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You're right, this topic is definitely lacking in our docs.

Depending on what you want to implement there are two mechanisms you can use:

1. If you want to add shortcuts to your app, you need to create and register so called "actions", which are basically callbacks that can be triggered by widgets or keyboard presses. After setting up and action, you can use set_accelerators_for_action to setup a keyboard shortcut that triggers the action: https://github.com/Relm4/Relm4/blob/main/examples/actions.rs#L68
2. If you want to get events for all key presses, you can add a EventControllerKey to a widget with add_controller. By connecting to the controllers key-pressed event, you should get an event for each key-press as long as the widget is in focus (I think if you use the main window, you should basically get all inputs).

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