From looking at lenovo's website and the manuals, it should have a HDMI port, Where i dont know as i cant see any photos of the I/O ports.
However, you are looking for something like this
its will be on the the sides, simply plug in the projector and see if it picks up video.
If it doesnt, try pressing f10 or FN f10 and see if windows will offer you the option of what to do with the second monitor.