Add: init serial + getting text out of it

src/kmain.c

@@ -3,6 +3,7 @@
 #include <limine.h>
 #include "io/term.h"
 #include "io/printf.h"
+#include "io/serial.h"
 
 // Limine version used
 __attribute__((used, section(".limine_requests")))
@@ -111,6 +112,10 @@ void kmain()
 
 	if (term_init()) hcf();
 
+	if (serial_init()) kputs("kernel: serial: error: Cannot init serial communication!");
+	
+	serial_kputs("\n\nkernel: serial: Hello, world from serial!");
+
 	// Draw something
 	printf("%s, %s!", "Hello", "world");