doc: add example image

Author: CC11001100

README.md

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 # AI 编程提示词构建工具
 
-在线部署：https://llm-sec.github.io/ai-coding-prompt-builder
+在线部署：https://llm-sec.github.io/ai-coding-prompt-builder
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+
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+![image-20250217045226044](./README.assets/image-20250217045226044.png)
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+![image-20250217045235401](./README.assets/image-20250217045235401.png)