How to simply include foo.txt bar.txt in doxygen

"[email protected]" <[email protected]> Mon, 2 Sep 2019 11:36:55 +0200

Newsgroups	gmane.text.doxygen.general
Message-ID	<[email protected]>

I want to just include some text .txt files in documentation.

And link them from the main index of doxygen.

How can this be done?