.gitignore & makefile update

GDT added, some workflow changes OS currently jumps into protected mode before the prerequisites are set, so execution fails

Second stage bootloader implemented Very whacky implementation of a bios-driven floppy "driver"

Workflow changes Recursive Makefiles added to support multiple, independent project parts

Update makefile Added 'rebuild' recipe, more sophisticated 'clear'

Create README.md

Hello World!