Add "For more general information, see OSDev.org", based on a recommendation from @noam-no

Closes codecrafters-io#1283

Co-Authored-By: Noam NIORT <n.niort@veniro.fr>

Author: FabriLluvia

README.md

@@ -256,6 +256,7 @@ It's a great way to learn.
 * [**Python**: _Neural Networks: Zero to Hero_](https://www.youtube.com/playlist?list=PLAqhIrjkxbuWI23v9cThsA9GvCAUhRvKZ)
 
 #### Build your own `Operating System`
+_For more general information, see OSDev.org_
 
 * [**Assembly**: _Writing a Tiny x86 Bootloader_](http://joebergeron.io/posts/post_two.html)
 * [**Assembly**: _Baking Pi – Operating Systems Development_](http://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/os/index.html)