How add in an old project Softdevice programming ability from keil MDK 5


I am newbies on nrf51 and keil uvision 5.

I just start to learn nrf51 development.

I saw that with keil 5, it is possible to flash Sofdevice directly from IDE uvision by using Flash_softdevice target..

So I would like to add this ability from an example project, serial uart, for example.

I open it and migrate the project to version 5 format.

Could someone explain necessary steps to add the softdevice.hex to this project and the ability to burn it directly from IDE?