doc: add GSO programmer's guide

Add programmer's guide doc to explain the design and use of the
GSO library.

Signed-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
Signed-off-by: Jiayu Hu <jiayu.

doc: add GSO programmer's guide

Add programmer's guide doc to explain the design and use of the
GSO library.

Signed-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
Signed-off-by: Jiayu Hu <jiayu.hu@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

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