Add a section in NIC drivers documentation to explain compiling and
testing of a PMD. It also mentions about host setup, which is required
before running testpmd.
Add label "testpmd_ug" to refer user guide.
Signed-off-by: Shijith Thotton <shijith.thotton@caviumnetworks.com>
Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Acked-by: John McNamara <john.mcnamara@intel.com>