Rosecrans Baldwin, a novelist and journalist, adds his unique voice in trying to make sense of what he calls the “city-state” of Los Angeles. He talks about L.A. as welcoming but somehow detached from the rest of America. While Baldwin argues that no single story can possibly represent all of L.A., in his new book “Everything Now,” he adds to the canon of LA. writers trying to define 5,000 square miles and 88 cities.