Added Authentication notebook for JS

[Rahul-Lashkari]

• Added JS equivalent for quickstarts/Authentication.ipynb notebook
• updated quickstarts-js/README.md

[gemini-code-assist]

Summary of Changes

Hello @Rahul-Lashkari, I'm Gemini Code Assist¹! 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 guide that educates users on how to securely set up and use API keys for authenticating with the Gemini API. It emphasizes the importance of environment variables for key storage and demonstrates how to configure the SDK, thereby expanding the existing JavaScript quickstart documentation.

Highlights

• New Authentication Quickstart: A new JavaScript notebook, Authentication.js, has been added to provide a quickstart guide for authenticating with the Gemini API, focusing on secure API key management.
• README Update: The quickstarts-js/README.md file has been updated to include the newly added Authentication notebook in the list of available quickstarts.

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[gemini-code-assist]

Code Review

This pull request adds a JavaScript equivalent of the Authentication notebook and updates the main README for JS quickstarts. The changes are well-structured and follow the established format for JS notebooks in this repository. My feedback focuses on improving the JavaScript code by using modern variable declarations (const) to avoid implicit globals, which enhances code safety and maintainability. I've also included a couple of minor suggestions to align the markdown content with the repository's style guide and improve readability.

[gemini-code-assist]

This sentence links to the "Get Started" guide twice, which is a bit redundant. For better readability and conciseness, you could rephrase it to mention each guide only once. For example:

"Now that you know how to manage your API key, you have everything you need to get started with Gemini. Check out the Get Started guide and the other quickstart guides in the Cookbook."