Add default PR template and CONTRIBUTING

.github/pull_request_template.md

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+<!--
+
+If you have not, please read the project [contribution guidelines](https://typelevel.org/projects/contributing-guide.html) before opening a pull request. 
+
+For reference, make sure that:
+
+- you respect the Typelevel code of conduct
+- your description, documentation and comments are human written
+- your contribution is not subject to any copyrights or patents that are incompatible with the project license
+- you are submitting a single self-contained change
+- you understand what you are contributing
+- you disclose any code not written by you
+- you replace these notes with a clear and succinct description
+
+Please also tag any related issues or PRs by referencing their number prefixed with a hash (#), eg. #12345, or a link if they are in a different repository.
+
+-->

CONTRIBUTING.md

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+# Contributing
+
+Contributors are expected to follow the [Typelevel Contributing Guide][tcg] and [Typelevel Code of Conduct][coc]
+
+If you are a new contributor, see the [Start Contributing Guide][scg].
+
+> [!CAUTION]
+> We do not permit the use of AI tools to generate issues or pull request descriptions.
+
+[tcg]: https://typelevel.org/projects/contributing-guide
+[coc]: https://typelevel.org/code-of-conduct/
+[scg]: https://typelevel.org/community/start-contributing