[Suggestion] Add a .zxbsproject File to the Root Folder

[Ultrahead]

Currently, when you use the Open Project command in ZXBS, you can open whatever folder you indicate, even in cases where there are no files that ZXBS can recognize. Unless you are accustomed to work with the IDE, that could lead to a "What?" moment.

Maybe a .zxbsproject file could be generated in the root folder of the project as a marker that indicates that indeed the folder being loaded is expected to be treated as the root folder.