By Erin Geiger Smith (Reuters) - Music producer Pharrell Williams filed a lawsuit Monday asking a U.S. court to rule he has not violated any trademark that Black Eyed Peas rapper will.i.am owns for the phrase "I AM." The lawsuit, filed in Manhattan federal court, said that will.i.am, whose real name is William Adams, has repeatedly sent letters to Williams demanding he stop using versions of the phrase "I AM" on a website founded by Williams, iamother.com. The website, according to the lawsuit, focuses on "encouraging individuality through different forms of expression. ...