x86_fat12bs/README.md

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### Summary
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Stage 1 loader loads stage 2 loader from the floppy and jumps to it.
Stage 2 loader initializes protected mode, detects system memory, loads the kernel from the floppy, and eventually calls "kmain" function in kernel.c.
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Yes the ASM code and the makefile could use some refactoring. Yes I know floor can be calculated simply by (x + y - 1) / y.
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### Building
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cd into "src" and Run "make".
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The boot image "boot.img" is generated under "src/out" directory.
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Use QEMU or Bochs to emulate.