Stage 1 Commit

Added stage 1 files to the repository.
[Directory - /src/boot/stage1/]
<ADD>  entry_flp.asm
<ADD>  Makefile
<ADD>  disk/fat12.asm
<ADD>  disk/floppy.asm
<ADD>  error/abort.asm
<ADD>  string/messages.asm
<ADD>  video/video.asm

[Directory - /]
<EDIT> README.md

Authors:
- Adrian Collado <acollado@citlink.net>