WIP Image imports and file access

Toolkit.Avalonia/FileProvider.cs

@@ -0,0 +1,32 @@
+using Avalonia.Controls;
+using Avalonia.Platform.Storage;
+using Toolkit.Foundation;
+
+namespace Toolkit.Avalonia;
+
+
+public class FileProvider(ITopLevelProvider topLevelProvider) :
+    IFileProvider
+{
+    public async Task<IReadOnlyCollection<string>> SelectFiles(FileFilter filter)
+    {
+        if (topLevelProvider.Get() is TopLevel topLevel)
+        {
+            IReadOnlyList<IStorageFile> storageFiles = await topLevel.StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions()
+            {
+                AllowMultiple = filter.AllowMultiple,
+                FileTypeFilter = new List<FilePickerFileType>
+                {
+                    new(filter.Name)
+                    {
+                        Patterns = filter.Extensions.Select(x => $"*.{x}").ToList()
+                    }
+                }
+            });
+
+            return storageFiles.Select(file => file.Path.LocalPath).ToList();  
+        }
+
+        return Array.Empty<string>();
+    }
+}