add PIC code from osdev

src/kernel.c

@@ -4,6 +4,7 @@
 #include "../include/utils.h"
 #include "../include/disk.h"
 #include "../include/string.h"
+#include "../include/pic.h"
 
 #include <stdint.h>
 
@@ -11,6 +12,7 @@ void kmain()
 {
 	terminal_initialize();
 	printf("KatauOS booting up\n");
+	pic_remap(0x20, 0x28);
 	isr_install();
 	printf("Kernel init sequence completed\n");