cmake: add url and description for feature summary
cmake: add url and description for feature summary

Signed-off-by: Alexander Dahl <9b466094ec991a03cb95c489c19c4d75635f0ae5@lespocky.de>

rafaelsteil/libcgi,LeSpocky/libcgi,rafaelsteil/libcgi,LeSpocky/libcgi