Add Pollinations.AI to Generative AI resources

[voodoohop]

This PR adds Pollinations.AI to the Generative AI resources section, along with an integration guide and demo notebook.

Pollinations.AI is a free, no-signup platform for generating images, text, and audio that's suitable for educational environments. The integration guide and demo are provided in both English and Chinese to maintain the multilingual nature of the repository.

The resources include:

• A bilingual integration guide explaining how to use Pollinations.AI in educational settings
• A simple Jupyter notebook demonstrating image generation with code examples

These resources aim to provide teachers and students with an accessible way to experiment with generative AI without requiring accounts or API keys.

中文说明

此PR将Pollinations.AI添加到生成式人工智能资源部分，并提供集成指南和演示笔记本。

Pollinations.AI是一个免费、无需注册的平台，适用于生成图像、文本和音频，非常适合教育环境。集成指南和演示以中英双语提供，以保持仓库的多语言特性。

资源包括：

• 双语集成指南，解释如何在教育环境中使用Pollinations.AI
• 简单的Jupyter笔记本，演示图像生成的代码示例

这些资源旨在为教师和学生提供一种无需账户或API密钥即可体验生成式AI的便捷方式。