def add_item(self, query_params=None):
return self.fetch_json(<EOL>uri_path=self.base_uri + '<STR_LIT>',<EOL>http_method='<STR_LIT:POST>',<EOL>query_params=query_params or {}<EOL>)<EOL>
Add an item to this checklist. Returns a dictionary of values of new
item.