(Reuters) – Grammy-winning British singer Adele is adding Bond girl to her superstar resume by signing on to write and sing the theme of the latest James Bond film "Skyfall" – her first song to be released since her best-selling heartbreak album "21" – Columbia Records said in a statement on Monday. Adele, 24, who swept the Grammy Awards earlier this year with accolades in six categories, will release the song on Friday on her official website, to coincide with the Bond film franchise's 50th anniversary and Global James Bond Day. …