addUsbReader
Adds a new external NFC reader connected via USB.
On Android, the ExternalNfcReaderStore.handleUsbDeviceAttached extension method can be used to automatically configuring supported devices when they are plugged in.
Return
a ExternalNfcReaderUsb for the added device.
Parameters
displayName
a human-readable name for the device.
vendorId
the vendor ID of the USB device.
productId
the product ID of the USB device.