def make_config(read_count, run_dir, sam_file):
    """ Create a config file for run """
    config_file = run_dir + "/config.csv"
    dataset = "test"
    metadata = "test"
    platform = "PacBio"

    with open(config_file, 'w') as o:
        o.write(",".join([dataset, metadata, platform, sam_file]) + "\n")

    return config_file