Numbered receipt

Write numbered(items) that returns a list of strings, one per item, numbered from 1: "1. apple", "2. bread", and so on.

numbered(["apple", "bread"])  ->  ["1. apple", "2. bread"]
numbered([])                  ->  []

def numbered(items):
    lines = []
    for ... in enumerate(items, start=1):
        ...
    return lines