Update README

Author: ManifoldFR

README.md

@@ -147,7 +147,8 @@ Please also consider citing the reference paper for the ProxDDP algorithm:
 * [Ludovic De Matteïs](https://github.com/LudovicDeMatteis) (LAAS-CNRS/Inria): feature developer
 * [Ewen Dantec](https://edantec.github.io/) (Inria): feature developer
 * [Antoine Bussy](https://github.com/antoine-bussy) (Aldebaran)
-* [Valentin Tordjman--Levavasseur](https://github.com/Tordjx) (Inria): feature developper
+* [Valentin Tordjman--Levavasseur](https://github.com/Tordjx) (Inria): feature developer
+* [Yann de Mont-Marin](https://github.com/ymontmarin) (Inria): Lie group formalism and associated features
 
 ## Acknowledgments