By Danielle Kaye NEW YORK (Reuters) -Apple Inc on Tuesday added 5G connectivity to its low-cost iPhone SE and iPad Air and introduced a high-performance chip for its new Mac Studio, a desktop aimed at creative professionals. Apple slightly hiked the price on the iPhone SE to $429 from $399 for the previous model. The new phone starts shipping March 18. The iPhone SE comes with an A15 Bionic chip, which Apple says is the fastest among competition, a 4.7-inch retina display and a home button with touch ID. “This is important for our existing users who want a smaller iPhone at a great value,” Chi…