Add file metadata (title, description, type) fields

[tzubaki]

Is your feature request related to a problem? Please describe.

We would like to give the possibility to a user to add metadata by file, like title, description and type.

Describe the solution you'd like

Add fields that give the possibility to add additional (optional) information on each file, like title, description and type. The information should be searchable.

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.