Show details about the Pricing API Index.

def index(pc):
    """
    Show details about the Pricing API Index.
    """
    click.echo("Format Version: {0}".format(pc.idx['formatVersion']))
    click.echo("Publication Date: {0}".format(pc.idx['publicationDate']))
    olist = ''
    for i,o in enumerate(pc.idx['offers']):
        if i < len(pc.idx['offers']) - 1:
            olist += o + ", "
        else:
            olist += o

    click.echo("Services Offered: {0}".format(olist))