Added UI skeleton for BMS settings screen

qml/Controls/ScrollBar.qml

@@ -1,6 +1,26 @@
 import QtQuick 2.12
 import QtQuick.Controls 2.12
 
-ScrollBar {
+import Utils 1.0
 
+ScrollBar {
+    id: control
+    size: 0.3
+    position: 0.2
+    active: true
+    orientation: Qt.Vertical
+
+    contentItem: Rectangle {
+        implicitWidth: 12
+        implicitHeight: 100
+        radius: width / 2
+        color: Palette.alternativeBackgroundColor
+        // Hide the ScrollBar when it's not needed.
+        opacity: control.policy === ScrollBar.AlwaysOn || (control.active && control.size < 1.0) ? 0.75 : 0
+
+        // Animate the changes in opacity (default duration is 250 ms).
+        Behavior on opacity {
+            NumberAnimation {}
+        }
+    }
 }