#2077 Highlight support

[Anonymous]

Originally created by: seaspeak

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

Support for highlight.

Describe the solution you'd like

per https://www.markdownguide.org/extended-syntax/#highlight
The syntax is ==Highlight me==

Describe alternatives you've considered
No.

Additional context
VNote supports <mark>, so this is of low priority.