Add simple checkbox and simple note editor for simple notes

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

• I would like to replace Google keep with something based on Nextcloud, however my wife thinks the current notes-android app is to complicated

Describe the solution you'd like

see additional context.

Describe alternatives you've considered

I have checked several apps, however they either do not play nice with Nextcloud share and sync
or they are to advanced.

Additional context

I have in my fork already implemented 2 new editors and modify the add button to show a selection of 3 note-types:

• simple note
• checklist
• Advanced note

then if you create a simple note, it gives you only a normal text input, no rich-text editor
if you select checklist then it gives you a simple ui to add check/uncheck items.
advanced note is using the current editor.

on open the note is evaluated:
if it contains only checkboxes - checklist item
if it only contains text - simple note
else - advanced note

from simple note and checkbox notes you can from settings open the advanced editor.

I also added support to show if a note is shared with a internal user (similar to the current link share)

• if the note is shared with only one user, it will show that users avatar
• else it will show a ring with the number of users that this note is shared with.

checkbox editor has the following features:

• sort by grab handle
• check/uncheck by clicking checkbox
• delete button deletes entry
• • Add item adds a new item
• backspace on empty item deletes it
• enter creates a new item
• settings->Uncheck all

No files or tests are named. Start by reviewing the current add-button flow and editor, then compare the fork's simple-note and checklist implementations. Done means supporting simple notes, checklists, advanced notes, their described editing actions, and the internal-share indicator without disrupting existing notes.