rework LLM section as per mlpack

CONTRIBUTING.md

@@ -13,6 +13,23 @@ can happen either here on Github or in the `#mlpack:matrix.org` channel on
 [here](https://www.mlpack.org/doc/developer/community.html) for more
 information.
 
+## Usage of LLMs / Coding Assistants
+
+Each contributor needs to understand the content they are proposing for ensmallen,
+and how the proposed content changes and/or expands functionality in ensmallen.
+Content includes source code, documentation, and other material such as images
+and datasets.  The pull request must justify the proposed content in the
+description.  Using coding assistants or tools like Large Language Models (LLMs) 
+does not grant additional privileges or reduce our expectations.
+
+Each contributor is responsible for the proposed content, regardless of where
+the content came from.  The responsibility includes ensuring that the content
+can be submitted to ensmallen and does not violate intellectual property rights
+such as copyright(s).  Source code in ensmallen is licensed under the BSD license;
+see `LICENSE.txt` for details.
+
+## Pull request process
+
 Once a pull request is submitted, it must be reviewed and approved before a
 merge, to ensure that: