New port: www/kurly

kurly is an alternative to the widely popular curl program.

kurly is designed to operate in a similar manner to curl, with select
features. Notably, kurly is not aiming for feature parity, but common
flags and mechanisms particularly within the HTTP(S) realm are to be
expected.

Reviewed by: swills
Approved by: swills (mentor)
Differential Revision: https://reviews.freebsd.org/D15332