By Chris Smith Atlanta United have bolstered their goalkeeping options with the signing of Quentin Westberg via free agency, the club announced Friday. Westberg has signed a one-year contract, keeping him at Mercedes-Benz Stadium through the 2023 MLS season. “Quentin is a proven goalkeeper in MLS and Europe, and we are excited to welcome him to Atlanta,” Atlanta United vice president and technical director Carlos Bocanegra said in a club press release. “We wanted to strengthen our depth at the goalkeeper position this offseason and Quentin will be a great addition to our group.” Westberg arriv…