wlogout: add example

wlogout/WlButton.qml

@@ -0,0 +1,21 @@
+import QtQuick
+import Quickshell.Io
+
+QtObject {
+	required property string command
+	required property string text
+	required property string icon
+	property var keybind: null
+
+	id: button
+
+	readonly property var process: Process {
+		command: ["sh", "-c", button.command]
+		manageLifetime: false
+	}
+
+	function exec() {
+		process.running = true;
+		Qt.quit();
+	}
+}