add CLAUDE.md

Author: RaduBerinde

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Pebble Development Environment
+
+Pebble is a LevelDB/RocksDB inspired key-value store focused on
+performance and internal usage by CockroachDB.
+
+## Testing
+```bash
+go test -tags invariants .
+go test -tags invariants ./...
+```
+
+## Regenerating test files
+```bash
+go test -tags invariants ./<package> --rewrite
+```
+
+## Linting
+```bash
+go test -tags invariants ./internal/lint"
+```
+
+## When generating PRs and commit records
+
+- Follow the format:
+  - Separate the subject from the body with a blank line.
+  - Use the body of the commit record to explain what existed before your change, what you changed, and why.
+  - Prefix the subject line with the package in which the bulk of the changes occur.
+  - For multi-commit PRs, summarize each commit in the PR record.
+  - Do not include a test plan unless explicitly asked by the user.
+
+## Interaction Style
+
+* Be direct and honest.
+* Skip unnecessary acknowledgments.
+* Correct me when I'm wrong and explain why.
+* Suggest better alternatives if my ideas can be improved.
+* Focus on accuracy and efficiency.
+* Challenge my assumptions when needed.
+* Prioritize quality information and directness.