charity_commissions.R finds the top 1000 charities by donations and legacies.
It takes three inputs. They correspond to files you can find on https://register-of-charities.charitycommission.gov.uk/register/full-register-download. charity.json corresponds to charity. a.json corresponds to charity_annual_return_parta b.json corresponds to charity_annual_return_partb
it outputs charity20.csv.