docs: acrn: Introduce ACRN

Add documentation on the following aspects of ACRN:

  1) A brief introduction on the architecture of ACRN.
  2) I/O request handling in ACRN.
  3) CPUID functions of ACRN.

To learn more about ACRN, please go to ACRN project website
https://projectacrn.org, or the documentation page
https://projectacrn.github.io/.

Cc: Dave Hansen <[email protected]>
Cc: Sen Christopherson <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Fengwei Yin <[email protected]>
Cc: Zhi Wang <[email protected]>
Cc: Zhenyu Wang <[email protected]>
Cc: Yu Wang <[email protected]>
Cc: Reinette Chatre <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Randy Dunlap <[email protected]>
Reviewed-by: Zhi Wang <[email protected]>
Reviewed-by: Reinette Chatre <[email protected]>
Reviewed-by: Borislav Petkov <[email protected]>
Signed-off-by: Shuo Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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