Conversion of parts dataframe to XML parts list

There is an XML import option on [bricks-to-go](https://bricks-to-go.com/how-to-buy-lego-using-xml-parts-lists-step-by-step-guide).com to submit an XML file to order the desired parts for the set.

After you get the build_pieces df, is there any work towards exporting this dataframe as an XML? I just don't want to have to enter each individual part every time I want to make a set.

Thanks!