add close button

LenaPi/Navigation.qml

@@ -4,18 +4,31 @@ import QtQuick 2.0
  * @brief Navigation view containing list view displaying artists or genres and albums
  */
 Item {
+    id: container
+    property int margins: 20
     RoundButton{
         id: back
 
         anchors.top: parent.top
         anchors.left: parent.left
-        anchors.margins: 20
+        anchors.margins: container.margins
 
         visible: navigationList.pIsBackVisible
 
         onClicked: navigationList.navigateBack();
     } // RoundButton: navigate back
 
+    RoundButton{
+        id: closeApp
+        anchors.right: parent.right
+        anchors.top: parent.top
+        anchors.margins: container.margins
+        imageSource: "qrc:/icon_close"
+        onClicked: {
+            Qt.quit();
+        }
+    } // RoundButton: closeApp
+
     Rectangle{
         anchors.left: parent.left
         anchors.right: parent.right