Nordic nRF51 dongle for NUS peripheral solution

1. Evaluate feasibility -
https://devzone.nordicsemi.com/question/44948/ble_peripheral-on-pca10031-dongle/

2. Virtual COM
Refer to user manual
http://infocenter.nordicsemi.com/pdf/nRF51_Dongle_UG_v1.0.pdf
P0.09 TXD
P0.11 RXD