Added XML Doc for Mode

Author: datvm

src/KristofferStrube.Blazor.FileSystemAccess/Options/DirectoryPickerOptions.cs

@@ -44,6 +44,11 @@ internal override ExpandoObject Serializable()
 public abstract class BaseDirectoryPickerOptions
 {
     public string? Id { get; set; }
+
+    /// <summary>
+    /// <see href="https://wicg.github.io/file-system-access/#enumdef-filesystempermissionmode">FileSystemPermissionMode browser specs</see>.
+    /// The default value is <see cref="FileSystemPermissionMode.Read"/>.
+    /// </summary>
     public FileSystemPermissionMode Mode { get; set; } = FileSystemPermissionMode.Read;
 
     internal virtual ExpandoObject Serializable()