Put README in the package

packages/main/README.md

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+# Google AI JavaScript SDK
+
+> [!IMPORTANT]
+> Thanks for your interest in the Google AI SDKs! **You can start using this SDK and its samples on December 13, 2023.** Until then, check out our [blog post](https://blog.google/technology/ai/google-gemini-ai/) to learn more about Google's Gemini multimodal model.
+
+The Google AI JavaScript SDK enables developers to use Google's state-of-the-art generative AI models (like Gemini) to build AI-powered features and applications.
+
+*More details and information coming soon!*
+
+## License
+
+The contents of this repository are licensed under the
+[Apache License, version 2.0](http://www.apache.org/licenses/LICENSE-2.0).