Added pull to refresh gesture (#8600)

Author: yaira2

src/Files.Uwp/Views/LayoutModes/ColumnViewBase.xaml

@@ -626,5 +626,10 @@ protected override void BaseFolderSettings_LayoutModeChangeRequested(object send
                 }
             }
         }
+
+        private void RefreshContainer_RefreshRequested(RefreshContainer sender, RefreshRequestedEventArgs args)
+        {
+            ParentShellPageInstance.FilesystemViewModel.RefreshItems(ParentShellPageInstance.FilesystemViewModel.WorkingDirectory, SetSelectedItemsOnNavigation);
+        }
     }
 }

src/Files.Uwp/Views/LayoutModes/ColumnViewBase.xaml.cs

@@ -806,5 +806,10 @@ private void FileList_Loaded(object sender, RoutedEventArgs e)
         {
             ContentScroller = FileList.FindDescendant<ScrollViewer>(x => x.Name == "ScrollViewer");
         }
+
+        private void RefreshContainer_RefreshRequested(RefreshContainer sender, RefreshRequestedEventArgs args)
+        {
+            ParentShellPageInstance.FilesystemViewModel.RefreshItems(ParentShellPageInstance.FilesystemViewModel.WorkingDirectory, SetSelectedItemsOnNavigation);
+        }
     }
 }