Resources, links for developement:
- https://docs.ankiweb.net/resources.html
- https://www.juliensobczak.com/write/2016/12/26/anki-scripting.html
- https://faqs.ankiweb.net/what-spaced-repetition-algorithm.html
- https://en.wikipedia.org/wiki/Spaced_repetition
- https://sourceforge.net/projects/ankiqpe/
- https://github.com/ankidroid/Anki-Android/wiki/Database-Structure