docs: explicitly mention supported spec version and transports in readme

[ishymko]

Re #677

[gemini-code-assist]

Summary of Changes

Hello @ishymko, 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 significantly improves the project's documentation by introducing a dedicated section in the README.md that outlines the SDK's compatibility. This update provides essential information regarding the implemented protocol specification version and the various communication transports supported, making it easier for users to understand the technical foundations and capabilities of the project.

Highlights

• Documentation Enhancement: A new 'Compatibility' section has been added to the README.md file to provide clear information about the SDK's supported specifications and transports.
• Protocol Specification: The README.md now explicitly states that the SDK implements the A2A Protocol Specification v0.3.0.
• Transport Support: A table has been included in the README.md to detail the supported transports (JSON-RPC, HTTP+JSON/REST, GRPC) for both client and server interactions.

Changelog

• README.md
  • Added a new 'Compatibility' section.
  • Included the supported A2A Protocol Specification version (v0.3.0) with a link to its documentation.
  • Provided a table detailing supported transports (JSON-RPC, HTTP+JSON/REST, GRPC) for both client and server.

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[gemini-code-assist]

Code Review

This pull request adds a new 'Compatibility' section to the README.md file, which is a great improvement for clarity. It explicitly states the supported A2A Protocol Specification version and the supported transports (JSON-RPC, HTTP+JSON/REST, and gRPC) for both client and server implementations. I've cross-referenced this with the codebase and the information appears to be accurate. I have one minor suggestion to improve the table's formatting for better readability.