This workflow is quite simple to create. The basic ideas is:
Create a new workflow Add a "Fold Lines Containing..." action Type "# " in the blank box with "Regular Expression" selected. (include the space after the hashtag)(no quotes)This will fold all lines in the document that start with a # followed by a space.
Note: There might be cases where you have a hashtag in the document, in which case a slight modification to the regular expression would be needed.*