add hello world bootloader code

.gitignore

@@ -0,0 +1 @@
+boot

README.md

@@ -1,3 +1,7 @@
 # Minimal bootloader
 
-https://www.youtube.com/watch?v=xFrMXzKCXIc
+```shell
+./run.sh
+```
+
+Tutorial: https://www.youtube.com/watch?v=xFrMXzKCXIc

boot.asm

@@ -0,0 +1,20 @@
+bits 16
+org 0x7c00
+
+mov si, 0
+
+print:
+	mov ah, 0x0E
+	mov al, [hello+si]
+	int 0x10
+	add si, 1
+	cmp byte [hello+si] ,0
+	jne print
+
+jmp $
+
+hello:
+	db "Hello World!", 0
+
+times 510 - ($ - $$) db 0
+dw 0xAA55

run.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+nasm boot.asm
+qemu-system-i386 boot