How to get plain text files in doxygen documentation?

@jasen 

To include plain text files in Doxygen documentation, you can use the include command in your Doxygen comments. Here's how you can do it:

1. Create a plain text file that you want to include in your documentation. Save it with a .txt extension.
2. In your Doxygen comments, use the include command followed by the path to the text file you want to include. For example:

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/**
 * ile
 * rief Description of the file
 *
 * include path/to/your/textfile.txt
 */

1. Run Doxygen on your codebase to generate the documentation. The plain text file will be included in the documentation at the specified location.

Note: Make sure to provide the correct path to the text file in the include command. Doxygen will include the contents of the text file as it is in the generated documentation.