Add the layer meta-skeleton, it will be used to place the various
canonical examples.
(From OE-Core rev: 3ccbfdecd0cd6c6d1476600b868647a9af46742e)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>