add qml demo app

client/ui/Main.qml

@@ -0,0 +1,34 @@
+
+import QtQuick
+import QtQuick.Controls
+
+import accordion
+
+ApplicationWindow {
+
+    visible: true
+    width: 1200
+    height: 800
+    title: "accordion"
+
+    TimerComponent {
+        id: timerComponent
+    }
+
+    Column {
+        anchors.centerIn: parent
+        spacing: 20
+
+        Label {
+            text: timerComponent.seconds + " s"
+            font.pixelSize: 32
+            horizontalAlignment: Text.AlignHCenter
+        }
+
+        Button {
+            text: "Reset"
+            onClicked: timerComponent.reset()
+        }
+    }
+
+}