doc: Update README

Author: coldfunction

README.md

@@ -1,2 +1,32 @@
 # cocotiOS
 A simple OS implementation for x86_64
+
+
+# Prerequisites
+* QEMU simulator or bochs
+* I only know QEMU...
+* nasm compiler
+* dd tool
+
+
+# How to compile
+```
+$ cd boot
+```
+```
+$ nasm -o mbr.bin mbr.S
+```
+```
+$ dd if=./mbr.bin of=../img/cocotiOS.img bs=512 count=1 conv=notrunc
+```
+```
+$ cd ../img/
+```
+```
+$ qemu-system-x86_64 cocotiOS.img
+```
+
+# Current results
+
+![](https://i.imgur.com/B3Ra9U8.png)
+