Recreate the missing root README.md (pyproject.toml declares
readme = "README.md", so packaging failed without it) as an English
landing page linking to docs/, README_CN.md, and 指标列表.md. All CLI
examples were verified against the runtime tool catalog and pass
tests/core/cli/test_cli_docs.py.
Also fix a 194 -> 193 typo in README_CN.md so the indicator count
matches the runtime pandas-ta-classic catalog and 指标列表.md.
Co-Authored-By: Claude Code <noreply@anthropic.com>