Feature request: description/remark section on the card

[Jan-Willem]

I would like to have a free text field, for example at the botom of the card for a description or remarks. Can be defined via yaml code

• The label of the field can be defined, including styling of the text via HTML for example
• Text field for description, remark etc. Also styling possible to use underline, italic, colors etc in the text

[Olen]

I personally believe the card would be quite cramped, but please provide a PR so we can look at how it would behave.