I just placed in a beta request.
A business partner and I heavily prefer to utilize markdown for note taking (we generally use Typora) but this poses problems when we are trying to colaborate on a document together.
Does Obsidian support real time collaborative editing?
Not yet, currently most of our users bring their own sync (Dropbox etc.), so if you edit the same document in real time that might create conflict copies.
We're working on a sync service with end-to-end encryption (for convenience, completely optional), and we might improve it to support real-time collaboration in the future.
Right now I think the closet thing is to use set up an encrypted folder with a third party app to use with Obsidian.