FileSystem

• A demo version of a tree-based UNIX file system.
• In order to start the program type "stack run" in the VS-Code terminal. If any problem occurs, type "stack init", then again repeat the procedure.
• Maintaing some of the main CRUD operations, when working with files.
• Feature for login and registering different users into the system.
• Feature for serializing the current system state into files as backup for later state restoring.