Enhance README and add star promotion assets

- Added a "Star us" section in both English and Chinese README files to encourage users to star the project on GitHub.
- Included a new image asset for the star promotion.
- Introduced a new HTML file for a dedicated star promotion page.
- Updated .gitignore to exclude new cursor-related files.

README.md

@@ -538,6 +538,14 @@ Phased delivery → [`docs/roadmap.md`](docs/roadmap.md).
 
 This is an early implementation — the closed loop (detect → pick skill + design system → chat → parse `<artifact>` → preview → save) runs end-to-end. The prompt stack and skill library are where most of the value lives, and they're stable. The component-level UI is shipping daily.
 
+## Star us
+
+<p align="center">
+  <a href="https://github.com/nexu-io/open-design"><img src="docs/assets/star-us.png" alt="Star Open Design on GitHub — github.com/nexu-io/open-design" width="100%" /></a>
+</p>
+
+If this saved you thirty minutes — give it a ★. Stars don't pay rent, but they tell the next designer, agent, and contributor that this experiment is worth their attention. One click, three seconds, real signal: [github.com/nexu-io/open-design](https://github.com/nexu-io/open-design).
+
 ## Contributing
 
 Issues, PRs, new skills, and new design systems are all welcome. The highest-leverage contributions are usually one folder, one Markdown file, or one PR-sized adapter: