Add initial CLAUDE.md

Author: pokey

CLAUDE.md

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+# Claude Helpers for Cursorless
+
+This file contains helpful hints for Claude when working with the Cursorless codebase.
+
+## Documentation Structure
+
+- Main documentation is in `/packages/cursorless-org-docs/src/docs/user/README.md`
+- Spoken forms are defined in `/cursorless-talon/src/spoken_forms.json`
+- Contributing documentation is in `/packages/cursorless-org-docs/src/docs/contributing/`
+
+## Project Organization
+
+- Main extension code is in `/packages/cursorless-vscode/`
+- Engine code is in `/packages/cursorless-engine/`
+- Tests are in `data/fixtures/recorded/`
+- Language-specific parsing is defined in the `queries/*.scm` files
+
+## Build and Test
+
+- Always run lint and typecheck when making changes:
+  - `pnpm run lint`
+  - `pnpm run typecheck`
+- Tests can be run with:
+  - `pnpm test`
+
+## Documentation Conventions
+
+When documenting actions or modifiers:
+- Include a brief description of what the item does
+- Include the format/syntax
+- Include at least one example
+- For versatile actions like `drink`, `pour`, `drop`, `float`, and `puff`, explain their behavior with different scope types
+- Always document special behaviors with different scope types
+
+## Implementation Notes
+
+- Many actions (`drop`, `float`, `puff`) work with both line and non-line targets
+- Always check test fixtures in `/data/fixtures/recorded/` to understand behavior
+- Implementation for many actions is in `/packages/cursorless-engine/src/actions/`
+
+## Pull Request Guidelines
+
+- Any feedback should be addressed in code or replied to
+- Tests should be included for new functionality
+- Documentation should be updated to reflect changes
+- Make sure changes are consistent with the project architecture