Documentation: describe how to add a system call

Add a document describing the process of adding a new system call,
including the need for a flags argument for future compatibility, and
covering 32-bit/64-bit concerns (albeit in an x86-centric way).

Signed-off-by: David Drysdale <[email protected]>
Reviewed-by: Michael Kerrisk <[email protected]>
Reviewed-by: Eric B Munson <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Randy Dunlap <[email protected]>
Reviewed-by: Josh Triplett <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>

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