function createSampleFile() {

  // Creates a new Google Docs document.
  const templateName = `[Template] ${APP_TITLE}`;
  const doc = DocumentApp.create(templateName);
  const docId = doc.getId();

  const msg = `\nDocument created: '${templateName}'
  \nURL: \n${doc.getUrl()}`

  // Adds template content to the body.
  const body = doc.getBody();

  body.setText(templateName);
  body.getParagraphs()[0].setHeading(DocumentApp.ParagraphHeading.TITLE);
  body.appendParagraph('Description').setHeading(DocumentApp.ParagraphHeading.HEADING1);
  body.appendParagraph('');

  const dateString = Utilities.formatDate(new Date(), Session.getScriptTimeZone(), 'MMMM dd, yyyy');
  body.appendParagraph(`${FIND_TEXT_KEYWORDS} - ${dateString}`).setHeading(APP_STYLE);
  body.appendTable().appendTableRow().appendTableCell('TL;DR');
  body.appendParagraph("");

  // Gets folder to store documents in.
  const folder = getFolderByName_(PROJECT_FOLDER_NAME)

  // Moves document to application folder.
  DriveApp.getFileById(docId).moveTo(folder);

  const ui = DocumentApp.getUi();
  ui.alert(`${APP_TITLE} [Template]`, msg, ui.ButtonSet.OK);
}
Creates a single document instance in the application folder.
Includes import settings already created [Heading | Keywords | Table]

Called from menu.