docs: Add README and more details package doc

[yarolegovich]

Details

1. README.md using a2a-python as a template.
2. A helloworld gRPC example.
3. Updated package docs.

Will be merged after all inflight-PRs are merged and the first release is created.

[gemini-code-assist]

Summary of Changes

Hello @yarolegovich, 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 onboarding experience and clarity. It introduces a thoroughly updated README.md that now provides extensive documentation, including features, installation, and usage examples for both server and client components. Complementing this, a new gRPC "helloworld" example has been added, offering a practical, runnable demonstration of how to build and interact with an A2A agent using gRPC.

Highlights

• Comprehensive README Update: The README.md has been entirely revamped, incorporating detailed sections on features, getting started, server/client examples, and project metadata, using the a2a-python README as a template.
• New gRPC Helloworld Example: A complete gRPC "helloworld" example has been added, demonstrating both client and server implementations for the A2A protocol.

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[gemini-code-assist]

Code Review

This pull request introduces a comprehensive README.md file and a helloworld gRPC example, which are great additions for new users of the library. The documentation provides a good overview and the example is helpful. My review includes a few suggestions to improve the accuracy of the code snippets in the README.md and to align the example code with idiomatic Go practices. Specifically, I've pointed out some typos and a duplicated code block in the README, and suggested improvements to command-line flag naming and logging in the example client and server.