expand detail in README

[davidhewitt]

An initial draft at contents for the README.

[hyperlint-ai]

PR Change Summary

Expanded the README to provide detailed information about the Rust SDK for Pydantic Logfire, including usage instructions, integration details, and contribution guidelines.

• Updated the project title and description to reflect the SDK's purpose and status.
• Added sections on usage, integration, and contribution guidelines.
• Included links to documentation and resources related to Logfire.

Modified Files

• README.md

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

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