Update README.md

README.md

@@ -51,6 +51,12 @@ This package comes with a set of Jupyter notebooks designed as a structured tuto
    - Trace outputs for iteration history.
    - Examples with `numethods.roots`.
 
+- [Polynomial Regression Demo](tutorials/polynomial_regression.ipynb)
+  - Step-by-step example of polynomial regression.
+  - Shows how to fit polynomials of different degrees to data.
+  - Visualizes fitted curves against the original data.
+  - Uses `PolyFit` from `numethods.fitting`.
+
 ---
 
 ## Features