After setting up the required toolchain, you are ready to compile your application and program (or "flash") it to your development kit.
Starting with v14.1.0, the nRF5 SDK supplies SEGGER Embedded Studio projects. If you are using an older version of the nRF5 SDK (for example, nRF5 SDK v12.3.0, which supports nRF51 Series devices), you must import and convert the Keil µVision projects.
There is a series of video tutorials that show how to get started with SEGGER Embedded Studio in combination with the nRF5 SDK. Check them out here: Getting started with SEGGER Embedded Studio and the nRF5 SDK