def validate_files_exist(root_dir):
    files = os.listdir(root_dir)
    if 'README.md' not in files:
        show_error_and_exit('Cannot find README.md in the root directory of the package.')
    if not get_license_file_name(root_dir):
        show_error_and_exit('Cannot find LICENSE in the root directory of the package.')
Checks if the required files (LICENSE, README, pom) exist
dataset/ETHPy150Open databricks/spark-package-cmd-tool/python/spark_package/spark_package.py/validate_files_exist