I am able to edit pictures using Camera Raw via Bridge and then Photoshop, but I much prefer to edit - especially for proofs - in Lightroom. When will Lightroom be able to read D750 raw files?
The question is asked almost daily. Support for the camera will be in the next release of Lightroom. No announced date because there never is an announced date. There is a release candidate of DNG converter 8.7 you can use in the meantime to create some DNG copies that you can use in Lightroom now. Then you can switch to your NEF files when the Lightroom update is released.
Amazing how many questions on this forum one can answer with one google search, copying the first link that comes up and keeping it on the clipboard to paste in!