Start Scalaz2 Exercise2

start-scalaz2-exercise2.scala

def get[K, V](k: K)(m: Map[K, V]): String \?/ V =
  try {
    m(k).success
  } catch {
    case e: Throwable => e.getMessage.failure
  }

def user(m: Map[String, String]): NonEmptyList[String] \?/ User =
  (get("id")(m).toValidationNEL |@| get("age")(m).flatMap(parseInt).toValidationNEL)((id, age) => User(id, age.toInt))