clang-format noop .clang-format file

I would like to start using clang-format in a extremely big existing code base. Before I commit to any of the clang-format options I would like to make sure that they work well and setting all the right rules at once could be extremely overwhelming.

I am looking on how to make clang-format to do nothing - or noop (no operation) .clang-format from which I could start modifying it to enable rules one by one.