AddMembers()

Will prompt the user for a csv file to add members to firebase. The csv file must have the following columns with exactly those names: * email -> the user's email, must be a string * firstName -> the user's first name, must be a string * lastName -> the user's last name, must be a string * types -> the types the user will get, must be a list of strings separated by a comma, spaces are okay, types must be the same ones used when setting up verification

Constructor