Added lab3

...terrupts_timer_keyboard/lab3-interrupts_timer_keyboard.md

...errupts_timer_keyboard/lab3-interrupts_timer_keyboard.pdf

...terrupts_timer_keyboard/skeleton/yoctos/common/keycodes.h

..._timer_keyboard/skeleton/yoctos/kernel/drivers/keyboard.c

..._timer_keyboard/skeleton/yoctos/kernel/drivers/keyboard.h

...rupts_timer_keyboard/skeleton/yoctos/kernel/drivers/pic.c

...rupts_timer_keyboard/skeleton/yoctos/kernel/drivers/pic.h

...pts_timer_keyboard/skeleton/yoctos/kernel/drivers/timer.c

...pts_timer_keyboard/skeleton/yoctos/kernel/drivers/timer.h

...pts_timer_keyboard/skeleton/yoctos/kernel/interrupt/idt.c

...pts_timer_keyboard/skeleton/yoctos/kernel/interrupt/idt.h

...timer_keyboard/skeleton/yoctos/kernel/interrupt/idt_asm.s

...pts_timer_keyboard/skeleton/yoctos/kernel/interrupt/irq.c

...pts_timer_keyboard/skeleton/yoctos/kernel/interrupt/irq.h

...ts_timer_keyboard/skeleton/yoctos/kernel/keymaps/keymap.c

...ts_timer_keyboard/skeleton/yoctos/kernel/keymaps/keymap.h

...er_keyboard/skeleton/yoctos/kernel/keymaps/keymap_fr_CH.c

...errupts_timer_keyboard/skeleton/yoctos/kernel/pmio/pmio.h

...pts_timer_keyboard/skeleton/yoctos/kernel/pmio/pmio_asm.s