zephyr_rtos_tutuorialsV2.0

This release include signed and encrypted image firmware update codes. Take a look to 005 project.
The stg-800 board zip file, the bootloader prj.conf file and stg_800.overlay file is attached.

prj.conf file path is : ~/zephyrproject/bootloader/mcuboot/boot/zephyr/prj.conf
stg_800.overlay file path is: ~/zephyrproject/bootloader/mcuboot/boot/zephyr/boards/stg_800.overlay