Add scroll bars to the computer grid and app grid

app/gui/AppView.qml

@@ -9,6 +9,7 @@ GridView {
     property int computerIndex
     property AppModel appModel : createModel()
 
+    id: appGrid
     anchors.fill: parent
     anchors.leftMargin: (parent.width % (cellWidth + anchors.rightMargin)) / 2
     anchors.topMargin: 5
@@ -87,4 +88,15 @@ GridView {
             }
         }
     }
+
+    ScrollBar.vertical: ScrollBar {
+        parent: appGrid.parent
+        anchors {
+            top: appGrid.top
+            left: appGrid.right
+            bottom: appGrid.bottom
+
+            leftMargin: -10
+        }
+    }
 }