Created JS equivalent of System_instruction.ipynb

[Aarchi-07]

[gemini-code-assist[bot]]

Summary of Changes

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This pull request introduces a new JavaScript quickstart guide designed to educate developers on the effective use of system instructions with the Gemini API. It provides comprehensive, runnable examples that illustrate how to steer model behavior for various applications, from adopting specific personas in conversations to generating code based on precise requirements, thereby enhancing the model's contextual understanding and response customization.

Highlights

• New JavaScript Quickstart: A new JavaScript quickstart file, System_instruction.js, has been added to demonstrate the use of system instructions with the Gemini API.
• System Instruction Examples: The new quickstart includes practical examples of how to set system instructions for single-turn content generation (e.g., persona adoption), multi-turn conversations, and code generation tasks.
• API Key Configuration Guidance: The file also provides clear instructions on securely configuring the Gemini API key using environment variables.

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