Add MINI_SUMMIT.md to discuss FastAPI benefits

[igorcosta]

This pull request introduces the new MINI_SUMMIT.md file to the repository, aimed at GitHub users interested in our API and the FastAPI framework for Python developers.

• Adds a warm welcome message: The file starts with a greeting to GitHub enthusiasts and developers, setting a friendly tone for the introduction to REST APIs with FastAPI.
• Highlights FastAPI's performance benefits: It details how FastAPI's design contributes to high performance in API development, emphasizing its asynchronous support and the advantages of the Starlette framework.
• Discusses ease of use and developer productivity: The content outlines FastAPI's features that enhance developer experience, such as automatic API documentation, a dependency injection system, and a design that encourages code reuse and modularity.
• Mentions community support and documentation: The file concludes by acknowledging the strong FastAPI community and the extensive, accessible documentation available, encouraging developers to engage with the community for support.

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[igorcosta]

Updates the welcome message in MINI_SUMMIT.md and adds new content in Business Japanese.

• Revises the welcome message to include Australian slangs, making it more engaging and humorous for the intended audience.
• Introduces two new paragraphs in Business Japanese, detailing the benefits of using REST APIs with the FastAPI framework, focusing on business process automation, efficiency improvement, security features, and the ability to provide reliable services while protecting customer data.

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For more details, open the Copilot Workspace session.