code: func (s *IssueService) AddComment(issueID string, comment *Comment) (*Comment, *Response, error) {
  	apiEndpoint := fmt.Sprintf("rest/api/2/issue/%s/comment", issueID)
  	req, err := s.client.NewRequest("POST", apiEndpoint, comment)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	responseComment := new(Comment)
  	resp, err := s.client.Do(req, responseComment)
  	if err != nil {
  		jerr := NewJiraError(resp, err)
  		return nil, resp, jerr
  	}
  
  	return responseComment, resp, nil
  }
docs: // AddComment adds a new comment to issueID.
  //
  // JIRA API docs: https://docs.atlassian.com/jira/REST/latest/#api/2/issue-addComment