docs: guide V1 users to PikaPython V2

Author: pikasTech

README.md

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 </p>
 <h1 align="center" style="margin: 30px 0 30px; font-weight: bold;">PikaPython</h1>
 <h4 align="center">Cross platform ultra lightweight embedded Python engine</h4>
+
+> PikaPython V2 is now available with a redesigned kernel, higher execution performance,
+> lower Flash and static RAM usage, a unified project CLI, and Code Agent workflows.
+> [Explore PikaPython V2](https://github.com/pikasTech/PikaPython/tree/v2).
+
 <p align="center">
 	<a href="https://gitee.com/lyon1998/pikapython/stargazers"><img src="https://gitee.com/lyon1998/pikapython/badge/star.svg?theme=gvp"></a>
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README_zh.md

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 </p>
 <h1 align="center" style="margin: 30px 0 30px; font-weight: bold;">PikaPython</h1>
 <h4 align="center">跨平台的超轻量级嵌入式 Python 引擎</h4>
+
+> PikaPython V2 已发布，提供重新设计的内核、更高的执行性能、更低的 Flash 与静态
+> RAM 占用，以及统一项目 CLI 和 Code Agent 开发流程。
+> [前往 PikaPython V2](https://github.com/pikasTech/PikaPython/tree/v2)。
+
 <p align="center">
 	<a href="https://gitee.com/lyon1998/pikapython/stargazers"><img src="https://gitee.com/lyon1998/pikapython/badge/star.svg?theme=gvp"></a>
 	<a href="https://gitee.com/lyon1998/pikapython/members"><img src="https://gitee.com/lyon1998/pikapython/badge/fork.svg?theme=gvp"></a>