Implement the project_wiki_markdown_content_example submodule

Working on this issue now in its parent issue!

We should make the "Complete remaining todos" a separate issue, it has nothing to do with this one.

Change the title as well...

The example module is now in place! Please review on the 1.x branch within the parent issue!

Fixed in the parent task, well done!

Automatically closed - issue fixed for 2 weeks with no activity.