Added Models.ipynb notebook for JavaScript

[Aarchi-07]

• Converted the existing Python notebook into a JavaScript implementation.
• Maintained the same logic, structure, and functionality as the original code.
• Improved code readability and consistency with JS best practices.

[gemini-code-assist[bot]]

Summary of Changes

Hello @Aarchi-07, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new JavaScript quickstart notebook, Models.txt, which is a direct translation of an existing Python notebook. The primary goal is to provide JavaScript developers with a clear guide on how to interact with the Gemini API to discover and inspect available models, including filtering by capabilities and retrieving detailed specifications like token limits. It also emphasizes secure API key management practices.

Highlights

• New JavaScript Quickstart Notebook: A new notebook, Models.txt, has been added to the quickstarts-js directory, providing a JavaScript implementation for interacting with the Gemini API.
• Python to JavaScript Conversion: The content of the new notebook is a direct conversion of an existing Python notebook, ensuring that the original logic, structure, and functionality are preserved while adhering to JavaScript best practices.
• Gemini API Model Management: The notebook demonstrates how to programmatically list all available Gemini API models, filter them based on supported actions (e.g., embedContent), and retrieve detailed information about specific models, including their input and output token limits.
• Secure API Key Configuration: Instructions and code examples are included for securely configuring the Gemini API key using environment variables, promoting best practices for sensitive information handling.

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