Update CONTRIBUTING.md

CONTRIBUTING.md

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 We welcome contributions!
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+In the spirit of openness, we welcome any updates, ideas, or suggestions to the 23 (research data) Things.
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+Our preferred method for receiving updates is via [GitHub Pull Request](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/about-pull-requests) to our [ARDC-23-Things repository](https://github.com/au-research/ARDC-23-things/).
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+If you are not comfortable submitting a pull request, then you can also [submit an issue](https://github.com/au-research/ARDC-23-things/issues/new) with a clear description of your updates.
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+By submitting content to 23 (research data) Things, you confirm and agree that all material submitted may be distributed under a [Creative Commons Attribution Licence](https://creativecommons.org/licenses/by/4.0/).