Add support for tags

[Pituivan]

I think tags would be a great feature to add to this project. You should be able to:

• Tag files / folders.
• Be able to visually differentiate tagged objects from not tagged ones.
• In the left panel, open tags so it's like a library of objects with the same tag.

Example from Files:

[R4GN3R0]

This would be a huge upgrade and one that I always wished for. +1