Create a datapackage.json file for a directory of CSV files.
The function will look for all .csv files in the directory and its
subdirectories.
It will then create a datapackage.json file with the metadata of each CSV
file.
See also
Other storage:
display_metadata(),
list_data(),
prune_meta(),
read_vc(),
relabel(),
rename_variable(),
rm_data(),
update_metadata(),
verify_vc(),
write_vc()