Apple will soon be selling its Vision Pro computer glasses in Germany, with the market launch planned for July 12, Apple chief executive Tim Cook announced on Monday at the Apple Worldwide Developers’ Conference (WWDC). The purchase price starts at €3,999 ($4,303). With the Vision Pro, users can immerse themselves in digital worlds. In addition to virtual reality (VR), the Apple headset is also designed to mix digital content with the real environment. Apple wants to establish the device for use with its Mac computers: Large displays appear in the glasses while you type on the visible real key…