Add CLAUDE.md

Adapted from Xarray under the Apache 2.0 license.

Author: VeckoTheGecko

CLAUDE.md

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+## GitHub Interaction Guidelines
+
+- **NEVER impersonate the user on GitHub**, always sign off with something like
+  "[This is Claude Code on behalf of Jane Doe]"
+- Never create issues nor pull requests on the GitHub repository unless
+  explicitly instructed
+- Never post "update" messages, progress reports, or explanatory comments on
+  GitHub issues/PRs unless specifically instructed
+- When creating commits, always include a co-authorship trailer:
+  `Co-authored-by: Claude <[email protected]>`