Update README with supported algorithm and news

[hiyuchang]

Description

As the title says

Checklist

Please check the following items before code is ready to be reviewed.

• Code has passed all tests
• Docstrings have been added/updated in Google Style
• Documentation has been updated
• Code is ready for review

[gemini-code-assist]

Summary of Changes

Hello @hiyuchang, 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 focuses on enhancing the project's documentation by adding detailed information about the supported reinforcement learning algorithms and recent project news. The updates are applied to both English and Chinese versions of the main README and the Sphinx documentation, providing users with a clearer understanding of the framework's capabilities and latest developments.

Highlights

• Updated Algorithm Support Documentation: The README.md and its Chinese counterpart, README_zh.md, have been updated to include a new section detailing the comprehensive algorithm support within Trinity-RFT. This section lists popular RL algorithms like PPO, GRPO, GSPO, TOPR, REC, and sPPO, along with examples of modular components for extending new algorithms (e.g., CISPO, SAPO for policy loss; RLOO, REINFORCE for advantage estimation), and hybrid approaches like CHORD and LLM-as-a-judge.
• New News Entry Added: A new news item for December 2025 has been added to both README.md and README_zh.md, highlighting Trinity-RFT's role in powering 'AI Medicine Finder' for understanding vague symptoms and providing precise recommendations.
• Sphinx Documentation Synchronization: The Sphinx documentation files, main.md and main_zh.md, have also been updated to reflect the new 'Comprehensive Algorithm Support' section, ensuring consistency across all documentation.

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[gemini-code-assist]

Code Review

This pull request updates the README files (both English and Chinese) and the corresponding Sphinx documentation to include a new section on supported algorithms and a recent news item. The changes are straightforward and well-propagated across all relevant documentation files. I've found a couple of minor issues in the Chinese documentation (README_zh.md and docs/sphinx_doc/source_zh/main.md) related to translation consistency and punctuation, for which I've provided suggestions. The English documentation looks good.

[yanxi-chen]

Please see inline comments. Otherwise lgtm.