By Andrew Downie (Reuters) – Of all the headlines Pele made on the football field, few of them came close to the remarkable announcement he made off it in 1975 – when he came out of retirement to sign for a little-known U.S. club called the New York Cosmos. Soccer in the United States was then still largely unknown, with the nascent semi-professional league still populated by wacky teams comprising Latin American janitors, American college students and European construction workers. Pele’s arrival in New York changed that, bringing fans, visibility and glamour for a short-lived period in which…