Style themes documentation

Hello Documenters

LibreOffice 5.2 has a nice experimental feature called Themes. It is a
way to change a set of automatic paragraph styles with predefined fonts,
color and layouts. Very handy, very well kept secret, not even a blog
post on it AFAIK.

Themes are activated when you enable experimental features in LO, in
Tools - Options - LibreOffice - Advanced - Enable experimental features.
Then in the Sidebar, you must select the Design entry in the Sidebar
configurations.

A double click on a font,color,or layout theme will change the
appearance of the whole document.

Anyone interested in writing a help page for this feature is welcome.
Bug entry for the help page is

https://bugs.documentfoundation.org/show_bug.cgi?id=105122

To write a help page, please follow the instructions in

http://documentation.libreoffice.org/en/join-community/update-help-contents/

Please let everybody knows here that you take the task.

Kind regards