[Feature Request] Checkbox elements on cards

[JeppeKlitgaard]

I thought it would be super neat if there was a toggle to display the amount of checkboxes that have been ticked in the first linked note of a card.

A little element saying "[2/9]" if 2 checkboxes out of 9 in the linked file were checked would be really useful for using Kanban for task tracking.

Additionally this could be expanded with a configuration option for including the tickboxes (and keeping them in sync) like on GitHub Projects:

[RickeyWard]

I'd really like to see this feature. though I would be quite satisfied with something as simple as having nested card tasks in the same .md file.

---
kanban-plugin: basic
---

## My List

- [ ] Card1 in list one
 - [ ] Sub task in card 1
 - [ ] Sub task in card 1
- [ ] Card2 in list one

Normally rendered in MD as:

My List

• [ ] Card1 in list one
  • [ ] Sub task in card 1
  • [ ] Sub task in card 1
• [ ] Card2 in list one

Maybe with some simple > | V icon to collapse and expand children

[AtrusRiven]

Cards with checkboxes on them would be very useful (e.g. for excerpting a book and listing different chapters with checkboxes).