Introduce Directories to Marketplace Vault

[nslobodin]

Yes, it's really annoying to find something in your vault. Maybe would be reasonable to have directories or custom collections to organize your vault.

[Wallenstein]

It's difficult to find something in your vault when you own many assets. A directory system would be nice where we can create our own folders and sort our assets so that we find them easier when we know we have a specific asset in the vault but don't know the name