docs(README): add overview section

[ccamel]

Add an overview section to provide a better introduction to the S3 proxy.

[coderabbitai]

Error: Could not generate a valid Mermaid diagram after multiple attempts.

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

README.md (1)

19-34: Mermaid Diagram: Validate Syntax and Rendering
The Mermaid diagram is a great addition for visualizing the access flow and interactions between components. However, please verify that the custom node definitions (e.g., actor@{ shape: circle, label: "🧑" }) and syntax (such as s3Proxy ~~~) are fully supported by the Mermaid renderer used in your documentation pipeline. If rendering issues occur, consider revising the syntax to adhere to standard Mermaid conventions.

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 06c114e and 4a8d26d.

📒 Files selected for processing (1)

• README.md (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: analyze-go

🔇 Additional comments (1)

README.md (1)

15-18: New Overview Section Added: Clear and Informative
The newly added "Overview" section provides a concise description of the S3 proxy's role and its integration with the Axone protocol. This enhances the documentation by giving users a clear introduction to the project.