Mirror contrib guidelines to GitHub (#41896)

add contrib guidelines

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+# Space Station 14 Contributing Guidelines
+
+Thanks for contributing to Space Station 14.
+When contributing, be sure to follow our [codebase conventions](https://docs.spacestation14.com/en/general-development/codebase-info/codebase-organization.html) and [PR guidelines](https://docs.spacestation14.com/en/general-development/codebase-info/pull-request-guidelines.html).
+
+Following these guidelines helps us increase review turnaround time, so be sure to review the linked documents in full.
+
+The last major guidelines update was on **December 6th, 2025**.
+
+### Why is this here?
+We put this here so that GitHub will notify you when submitting a pull request that the PR guidelines have changed, if you haven't read the latest version.