Add a settings dialog #91
Description
Similar to the work done in #87, it would be nice to have a kind of preconfigured dialog for showing settings. This is inspired by the components that libadwaita provides to make sure that apps a consistent in design even in more larger-grained components like settings and so on. https://gnome.pages.gitlab.gnome.org/libadwaita/doc/1.5/widget-gallery.html#preferences-dialog