pos-cashier-printer v0.0.1

Apologize

This is actually update version from https://github.com/bebo925/ng-thermal-print. The original repo is not maintenanced so I clone and update accordingly.

Update

The update in this repo are:

• BluetoothLowEnergyDriver The BluetoothLowEnergyDriver works on smartphone to connect thermal printer via bluetooth.
• BluetoothSerialDriver The BluetoothSeerialDriver works on desktop to connect thermal printer via bluetooth.