Add link to kaiyuan-mindformers in README

README.md

@@ -27,6 +27,7 @@ Other artifacts:
 * The dataset used to train Kaiyuan-2B is published at <https://huggingface.co/datasets/thu-pacman/PCMind-2.1-Kaiyuan-2B>.
 * The _PCMind-2.1-Kaiyuan-2B Technical Report_ is published at <https://arxiv.org/abs/2512.07612>.
 * The data preprocessing framework built on PySpark is published at <https://github.com/thu-pacman/Kaiyuan-Spark>.
+* The training framework built on [MindFormers](https://github.com/mindspore-lab/mindformers) is published at <https://github.com/thu-pacman/kaiyuan-mindformers> (`kaiyuan` branch).
 
 ## Introduction