Import KiCad power library from <https://github.com/KiCad/kicad-library/raw/af0f01971809334bbfe6d6f22faec33e7056694c/library/power.lib>.
Use KiCad power library.
Add power flags required by KiCad.
Move the MCU symbol so it's grid aligned.
Add power and ground connections to MCU.