Want to make $200 a day in New York City? Rush to the scene of a murder, a three-alarm fire or a traffic accident — then pull out your phone and start filming. That’s the pitch from Citizen, a controversial neighborhood watch app that’s quietly hiring New Yorkers to livestream crime scenes and other public emergencies in an apparent effort to encourage more ordinary citizens to do the same, The Post has learned. Citizen has raised $133 million from high-profile backers like Peter Thiel, as well as the Silicon Valley venture firms Sequoia Capital and Greycroft, by promising real-time safety...