Append citation info to a formatted dataset

Given an existing formatted dataset, and the path to the downloaded dataset, from retriever, and via import_retriever_data(), read in the citation info and add it to the metadata for the dataset

append_retriever_citation(formatted_data, path)

Arguments

formatted_data	a dataset that already follows the `MATSS`` standard
path	where to load the raw data files from

Value

the same dataset, with the citation appended to metadata