The Blue Monster is back. The PGA Tour is returning to Trump National Doral in Miami after a 10-year hiatus for the Cadillac Championship. The fifth of eight signature events, there’s no cut and the winner from the 72-player field will collect $3.6 million from the $20 million purse.  From its field, course, Doral’s history, tee times and how to watch, here’s what you need to know for the new Cadillac Championship.  The field: A signature event, but not with everyone With the Cadillac Championship sandwiched between two majors and two other signature events in a six-month span, there’s been a hullabaloo about who’s opted not to play at Doral .  Those omissions are Rory McIlroy, Matt Fitzpatrick, Bob MacIntyre, Ludvig Aberg and Xander Schauffele. That’s five of the top 15 players in the world.  The event, however, won’t be bereft of talent. World No.…