Reference:https://github.com/pritamzope/OS/blob/master/VGA/kernel_c/Reference/Intel%20OpenSource%20HD%20Graphics.pdf
vga_hello.asm : This source is same as we did in Kernel.c source. It points to VGA addreess 0xB800, with colors 4 bits, and 80*20 resolution font.
color_change.asm : Background colors changes as any key is pressed.
rotate_text.asm : Rotate the text to the right position with changing fore and back color by incrementing VGA index as any key is pressed.