Installing NIO driver in MQX for KSDK

Hello All,

Next document lists the steps needed to install a basic NIO driver in MQX for KSDK 1.3. In this document, a basic SPI driver for FRDM-K64F was created in order to serve as guidance for any user's driver.

Source and header file for this NIO SPI are attached as well as hello.c source files that was taken from hello_world example in order to test this driver.