added backnavigation and qrc

LenaPi/RoundButton.qml

@@ -0,0 +1,32 @@
+import QtQuick 2.0
+
+Rectangle {
+    id: container
+    property alias imageSource: image.source
+    signal clicked();
+
+    border.width: 2
+    border.color: "grey"
+
+    color: "white"
+
+    width: 50
+    height: width
+    radius: width/2
+
+    Image{
+        id: image
+        anchors.centerIn: parent
+        width: 30
+        height: width
+        source: "qrc:/icon_back"
+    }
+
+    MouseArea{
+        id: controlObject
+        anchors.fill: parent
+        onClicked:{
+           container.clicked();
+        }
+    }
+}