Update README.md -- Backpropagating quasi-randomized neural networks

Add info on Backpropagating quasi-randomized neural networks

Author: thierrymoudiki

README.md

@@ -3,7 +3,7 @@ tisthemachinelearner
 
 <hr>
 
-Lightweight interface to scikit-learn with 2 classes, `Classifier` and `Regressor. 
+Lightweight interface to scikit-learn with 2 classes, `Classifier` and `Regressor`. Home of `FiniteDiffRegressor` (see **Backpropagating quasi-randomized neural networks** [https://thierrymoudiki.github.io/blog/2025/06/23/python/backprop-qrnn](https://thierrymoudiki.github.io/blog/2025/06/23/python/backprop-qrnn)). 
 
 ![PyPI](https://img.shields.io/pypi/v/tisthemachinelearner) [![PyPI - License](https://img.shields.io/pypi/l/tisthemachinelearner)](LICENSE) [![Downloads](https://pepy.tech/badge/tisthemachinelearner)](https://pepy.tech/project/tisthemachinelearner) 
 [![Documentation](https://img.shields.io/badge/documentation-is_here-green)](https://techtonique.github.io/tisthemachinelearner/)