[FEAT]: Add tip support to flashcards

[EvilsSouls]

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

I often find it helpful to learn, for example, vocabulary by using tips. This makes learning a lot easier, as you then associate the flashcard with that tip.

Describe the solution you'd like

It would be great, if you'd be able to press a button on a flashcard if you can't remember the answer, which would show you a tip. You'd also need a special syntax for defining a tip. I personally think that one good way of doing this, is by having the tip be surrounded by double brackets: How do you say "hello" in Spanish? :: hola ((<tip>))

Additional context

No response