Add CLAUD.md

Author: rwightman

CLAUDE.md

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+# CLAUDE.md - PyTorch Image Models (timm)
+
+## Build/Test Commands
+- Install: `python -m pip install -e .`
+- Run tests: `pytest tests/`
+- Run specific test: `pytest tests/test_models.py::test_specific_function -v`
+- Run tests in parallel: `pytest -n 4 tests/`
+- Filter tests: `pytest -k "substring-to-match" tests/`
+
+## Code Style Guidelines
+- Line length: 120 chars
+- Indentation: 4-space hanging indents, arguments should have an extra level of indent, use 'sadface' (closing parenthesis and colon on a separate line)
+- Typing: Use PEP484 type annotations in function signatures
+- Docstrings: Google style (do not duplicate type annotations and defaults)
+- Imports: Standard library first, then third-party, then local
+- Function naming: snake_case
+- Class naming: PascalCase
+- Error handling: Use try/except with specific exceptions
+- Conditional expressions: Use parentheses for complex expressions