feat: first draft of CONTRIBUTING guidelines

CONTRIBUTING.md

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+# Documentation Website Contributing Guidelines
+
+Edits to the website built by this repository can be made either directly through GitHub or via a local clone. Currently all members of the `network-office` and `info-managers` teams have the ability to make edits and triage issues in this repository.
+
+## Documenting Changes
+
+Please document all substantive edits in the [NEWS.md](https://github.com/lter/docs-network/blob/main/NEWS.md) file in the top level of this repository. High-level summaries of changes there will make the strategic summary of changes easier to track through time and will allow for more informative [GitHub release](https://docs.github.com/en/repositories/releasing-projects-on-github/about-releases) details.
+
+## Minor Edits
+
+When making minor edits, feel free to make those directly in the "main" branch.
+
+## Major Edits
+
+If making major edits--either to particular documents or to the structure of the website--please create a [branch](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-branches) for those edits and submit a pull request when you are ready to have those changes be reflected in the live website.