My attempt at writing an operating system(expect it to fail)
Open the terminal and cd to where you put this repository. Than execute
# sh build.sh
That will build the files in src and add the output to the floppy.img file.
To run this OS you either use qemu or physical hardware. With qemu it is easy, just run ./run_qemu.sh and you'll be fine. For physical hardware you have to do a little more. You will need a floppy, and do 'dd if=floppy.img of=/dev/fd0 bs=512' assuming that your floppy is at /dev/fd0.