Add blog link for madman-optimagic

Author: spline2hg

2025/blogs.md

@@ -42,6 +42,9 @@ This page is for the contributor blogs of NumFOCUS, Google Summer of Code 2025.
 
 - [Open2C](https://github.com/open2c/open2c.github.io/wiki/GSoC-2025)
 - [optimagic](https://github.com/optimagic-dev/optimagic/discussions/559)
+
+    madman [Adding More Optimizer Interfaces to optimagic](https://madmann.bearblog.dev/summarizing-my-gsoc-2025-work-adding-more-optimizer-interfaces-to-optimagic/)
+
 - [pvlib](https://github.com/pvlib/pvlib-python/wiki/GSoC-2025-Projects)
 - [PyBaMM](https://pybamm.org/gsoc/2025/)