Hi @yoursanil3 ,
You can develop the code in MCUXpresso IDE you just need to download the SDK of the part, the MK22FN512VLL12 is used in the Kinetis K22 family, so you can use the SDK from the FRDM-K22F as reference.
In the FRDM-K22 SDK you would find examples.
One way to download the SDK is via MCUXpresso:


Other way is from SDK Builder in the official NXP page:
Hope it helps you!