devel/py-zxcvbn-python: add new port
zxcvbn is a password strength estimator inspired by password
crackers. Through pattern matching and conservative estimation, it
recognizes and weighs 30k common passwords, common names and surnames
according to US census data, popular English words from Wikipedia and
US television and movies, and other common patterns like dates,
repeats (aaa), sequences (abcd), keyboard patterns (qwertyuiop), and
l33t speak.