Add scroll bars to the computer grid and app grid

app/gui/PcView.qml

@@ -10,6 +10,7 @@ import ComputerManager 1.0
 GridView {
     property ComputerModel computerModel : createModel()
 
+    id: pcGrid
     anchors.fill: parent
     anchors.leftMargin: 5
     anchors.topMargin: 5
@@ -227,4 +228,15 @@ GridView {
             }
         }
     }
+
+    ScrollBar.vertical: ScrollBar {
+        parent: pcGrid.parent
+        anchors {
+            top: pcGrid.top
+            left: pcGrid.right
+            bottom: pcGrid.bottom
+
+            leftMargin: -10
+        }
+    }
 }