def ADD(*expressions):
return {'<STR_LIT>': list(expressions)}<EOL>
Adds numbers together or adds numbers and a date.
If one of the arguments is a date, $add treats the other arguments as milliseconds to add to the date.
See https://docs.mongodb.com/manual/reference/operator/aggregation/add/
for more details
:param expressions: The numbers or fields of number
:return: Aggregation operator