Hey @roemerr you can import a classmate's screen elements from Design Mode but it doesn't keep your apps in sync or anything like you might expect from a Google Doc. It's a 1-time import. Here's where you can find that if that sounds interesting.
You can of course always use the "Share" button to share a link to your project and eventually the code.
That said, I think you (and I, and many other teachers) probably are asking for live-editing a shared project like a Google Doc. It's a really big feature and very technologically complex to create. The short answer here is "No we don't currently have a plan to make that" since other engineering requests are taking priority. Who knows, perhaps one day, but I wouldn't expect it in the next year or so for example.
Hope that helps!