docs: Refine product demonstration section in README

refactor: update nextjs, react ...

docs: 更新 nextjs 和 react 技术栈最佳实践规则

docs: add C# development rule file

docs: update README.md

docs: update README.md

docs: update README.md

docs: update README.md

docs: add kotlin and android mdc file. Improve the specification descriptions.

Update README.md

docs: 更新README.md，详细列出当前支持的编程语言和框架，添加Java语言规范及最佳实践，增强文档结构和可读性。

Update README.md

Update README.md

add react-native.mdc

Update README.md