[Intro] Add Border

Given a rectangular matrix of characters, add a border of asterisks(*) to it.

def addBorder(picture):
    a = len(picture[0]) + 2
    return ["*" * a] + ["*" + i + "*" for i in picture] + ["*" * a]

"*"+i+"*"말고 i.center()쓰는것도 좋은 방법이다.