Add FinClaw: AI-native quant engine with genetic algorithm evolution (#74)

FinClaw is a Python-based quantitative finance engine that uses
genetic algorithms to automatically evolve trading strategies.

Key features:
- 484 built-in factors (technical, fundamental, sentiment, crypto)
- Walk-forward validation to prevent overfitting
- Multi-market support: A-shares, US stocks, cryptocurrency
- 7900+ tests, CI/CD, PyPI published (pip install finclaw-ai)

GitHub: https://github.com/NeuZhou/finclaw

Co-authored-by: NeuZhou <neuzhou@users.noreply.github.com>

Readme_cn.md

@@ -82,6 +82,7 @@ Note: 如果标有`Live Trading` 表示具有实时交易功能（至少一个
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