Add isHardware flags (#210)

* Add isHardware flags

* Ledger connection  options

packages/ui-settings/src/defaults/ledger.ts

@@ -0,0 +1,25 @@
+// Copyright 2017-2019 @polkadot/ui-settings authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+import { Option } from '../types';
+
+export const LEDGER_CONN_DEFAULT = 'none';
+
+export const LEDGER_CONN: Option[] = [
+  {
+    info: 'none',
+    text: 'Do not attach Ledger devices',
+    value: 'none'
+  },
+  {
+    info: 'u2f',
+    text: 'Attach Ledger via U2F',
+    value: 'u2f'
+  },
+  {
+    info: 'webusb',
+    text: 'Attach Ledger via WebUSB',
+    value: 'webusb'
+  }
+];