naortega/BasicKernel: Code for writing a basic OS from scratch.

Nicolás Ortega Froysa 3f35a78c07 Should be working, but function call fails.		6 lat temu
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screen.c	3f35a78c07 Should be working, but function call fails.	6 lat temu
screen.h	3f35a78c07 Should be working, but function call fails.	6 lat temu