code: def build_header(self, title):
          
          header = ['---',
                    'title: ' + title,
                    'author(s): ' + self.user,
                    'tags: ',
                    'created_at: ' + str(self.date_created),
                    'updated_at: ' + str(self.date_updated),
                    'tldr: ',
                    'thumbnail: ',
                    '---']
  
          self.out = header + self.out
docs: Generate the header for the Markdown file.