Add DeepAlpha - AI trading with XGBoost/LightGBM ensemble

[stefanoviana]

Hi! I would like to suggest adding DeepAlpha to this awesome list.

What is DeepAlpha?
AI crypto trading bot with 70.9% walk-forward validated accuracy. XGBoost + LightGBM ensemble with 72 engineered features for financial time series prediction. MIT license. Available on PyPI (pip install deepalpha).

Suggested section: Machine Learning / Time Series / Finance

Suggested entry:

- [DeepAlpha](https://github.com/stefanoviana/deepalpha) - AI crypto trading bot with 70.9% walk-forward validated accuracy. XGBoost + LightGBM ensemble with 72 features.

Thank you!