Added blinky example to the BLE DEV.N SDK (Bluetooth Low Energy)

Today we added blinky example to the SDK. It assumes that board is pre-programmed with SoftDevice and Bootloader. If you do not have such, you need to change memory areas as follows IROM1 start 0x0, size 0x40000, IRAM1 start 0x20000000, sizeĀ 0x4000 for 256k chip.