feat: add 2b pack with lessons 13 thru 25

content/Hanyu-Jiaocheng/README.md

-# Vocabulary from Anki
-This example builds Vocabulary cards from simple Front/Back cards that were
-exported from Anki.
-
-To generate the .txt file, click the wheel when hovering the root of thr deck
-you want to export and hit _Export…_ and select _Notes in Plain Text (.txt)_ as
-the format. Check everything, e.g. the deck name and unique identifier.
-
-See [.apkg-spec.yaml](.apkg-spec.yaml) for an example of how to handle such a
-file.
-
-## Images
-If you use images, put them into a directory and add that to the resource path.
-
-See for example
-[sinology-1](https://gitlab.phaidra.org/kartenaale/packs/sinology-1/-/blob/main/content/Einf%C3%BChrung-in-die-politische-Geschichte-Chinas/.apkg-spec.yaml)
-as an example of how to do this.