Taylor Sheridan, Paramount and NBC Universal are all being sued by a writer who says Sheridan stole her idea for a TV show and used it to create Yellowstone. In the suit, filed in the U.S. District Court for the Central District of California on Friday, TV writer and entertainment journalist Lauren J. Salkin claims she submitted a pilot script, show bible and pitch deck for a show called Sovereign Nation to Sheridan’s reps at his management company, Elevate Entertainment, which is also named as a defendant in the suit, in late 2016 and early 2017. Sovereign Nation, which Salkin spent more than 10 years developing, is described in the…