Improve contributing.md

[yxdyc]

Improve the contributing.md for more detailed guidance and engagement.

[gemini-code-assist]

Summary of Changes

Hello @yxdyc, 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 CONTRIBUTING.md file for the Trinity-RFT project. The update transforms the previous brief guide into a comprehensive resource, providing clear instructions and expectations for contributors. It aims to streamline the contribution process by detailing the project's architecture, outlining specific areas for involvement, introducing a "Plugin-First" development approach, and establishing a thorough submission checklist, ultimately fostering more organized and higher-quality contributions.

Highlights

• Enhanced Contribution Guide: The CONTRIBUTING.md file has been completely revamped to offer a more detailed and structured guide for potential contributors, moving beyond generic instructions.
• Structured Contribution Areas: A new section outlines specific focus areas within the Trinity-RFT framework, such as Agentic Workflows, RL Algorithms, and Data & Experience, providing clear interfaces and potential tasks.
• "Plugin-First" Development Workflow: A new workflow is introduced, encouraging contributors to develop features as plugins first, allowing for auto-loading and later integration into the core framework.
• Comprehensive Submission Checklist: A detailed checklist now guides contributors through the PR submission process, covering registration, testing, code style, and clear description requirements.

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[gemini-code-assist]

Code Review

This pull request provides a significant improvement to the CONTRIBUTING.md file, making it much more comprehensive and helpful for new contributors. The addition of sections on contribution areas, the 'Plugin-First' approach, and a clear submission checklist are excellent. I have a couple of minor suggestions to further enhance the clarity and consistency of the document.