docs(readme): ask readers to star the project

Adds a centered star call-to-action under the badge row in both the
English and Simplified Chinese READMEs.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

README.md

@@ -19,6 +19,10 @@
   <a href="https://github.com/Ark0N/Codeman/commits/master"><img src="https://img.shields.io/github/commit-activity/t/Ark0N/Codeman?style=flat-square&color=1e3a5f" alt="Total commits"></a>
 </p>
 
+<p align="center">
+  ⭐ <strong>Like Codeman? <a href="https://github.com/Ark0N/Codeman">Give it a star on GitHub!</a></strong> It takes one click and helps more people find the project. ⭐
+</p>
+
 <p align="center">
   <strong>English</strong> &bull; <a href="README.zh-CN.md">简体中文</a>
 </p>

README.zh-CN.md

@@ -23,6 +23,10 @@
   <a href="https://github.com/Ark0N/Codeman/commits/master"><img src="https://img.shields.io/github/commit-activity/t/Ark0N/Codeman?style=flat-square&color=1e3a5f" alt="Total commits"></a>
 </p>
 
+<p align="center">
+  ⭐ <strong>喜欢 Codeman？<a href="https://github.com/Ark0N/Codeman">在 GitHub 上给它点个 Star 吧！</a></strong>只需轻点一下，就能帮助更多人发现这个项目。⭐
+</p>
+
 <p align="center">
   <img src="docs/images/subagent-demo-20260724.gif" alt="Codeman — 并行子智能体可视化" width="900">
 </p>