Add bundle.ts files for browser bundling (#502)

packages/ui-settings/src/bundle.ts

@@ -0,0 +1,9 @@
+// Copyright 2017-2021 @polkadot/ui-settings authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import { Settings, settings } from './Settings';
+
+export { ENDPOINT_DEFAULT, ICON_DEFAULT, ICON_DEFAULT_HOST, LANGUAGE_DEFAULT, LOCKING_DEFAULT, PREFIX_DEFAULT, UIMODE_DEFAULT, UITHEME_DEFAULT } from './defaults';
+export { packageInfo } from './packageInfo';
+
+export { settings, Settings };