Please document or link to documentation for .clang-tidy files

I want to have the settings stored in the sources of my project, but I have no idea how to write a .clang-tidy file.

https://doc.qt.io/qtcreator/creator-clang-tools.html#configuring-clang-tools says:

In the Clang-Tidy tab, select Select Checks to select the checks to perform, Use .clang-tidy Config File to read them from a Clang-Tidy configuration file, or Disable to disable them.

It would be great if it could link to https://clang.llvm.org/extra/clang-tidy/:

Configuration files:
clang-tidy attempts to read configuration for each source file from a
.clang-tidy file located in the closest parent directory of the source
file. If any configuration options have a corresponding command-line
option, command-line option takes precedence. The effective
configuration can be inspected using -dump-config

However, even Clang's docs don't provide an example of what a .clang-tidy file looks like. It would be so helpful if the documentation provided an example of a .clang-tidy file with a few checks so that users can learn how to use them.