Keyboard support!

This is a very simple operating system for my practice.
The operating system can now boot, go into protected mode, set tty, set gdt and idt, receive interrupts and now support keyboard.
It still can not support storage and paging and is the target of the future.

First Release!

This is a very simple operating system for my practice.
The operating system can now boot, go into protected mode, set tty, set gdt and idt, and receive an interrupt.
It still can not support the keyboard and is the target of the future.