Enhance training description in README

Updated README to include '(mini-)batchsize' in the training description.

Author: Yif-Yang

README.md

@@ -1,6 +1,6 @@
 # SkillOpt: Executive Strategy for Self-Evolving Agent Skills
 
-*Train agent skills like you train neural networks — with epochs, learning rates, and validation gates — but without touching model weights.*
+*Train agent skills like you train neural networks — with epochs, (mini-)batchsize, learning rates, and validation gates — but without touching model weights.*
 
 [![Project Page](https://img.shields.io/badge/Project%20Page-SkillOpt-8dbb3c)](https://microsoft.github.io/SkillOpt/) [![Paper](https://img.shields.io/badge/Paper-arXiv-b31b1b)](https://arxiv.org/abs/2605.23904) [![Project Video](https://img.shields.io/badge/Project%20Video-Watch%20Demo-ff0000)](https://youtu.be/JUBMDTCiM0M) [![Python 3.10+](https://img.shields.io/badge/Python-3.10%2B-blue.svg)](https://www.python.org/) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](LICENSE)