Update main readme for v0.2.1

[yanxi-chen]

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 @yanxi-chen, 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 updates the main README.md file to reflect recent advancements and features in the Trinity-RFT project, particularly for the v0.2.1 release and in preparation for v0.3.0. The changes enhance the documentation by detailing new capabilities in agentic reinforcement learning, improved training scheduling, and the introduction of new algorithms, alongside updating architectural diagrams and tutorial links for better clarity and guidance.

Highlights

• News Section Update: The "News" section has been significantly updated to highlight the features of Trinity-RFT v0.2.1, including enhanced Agentic RL capabilities, new rollout-training scheduling mechanisms, a benchmark tool, and the integration of several new RL algorithms.
• Core Feature Descriptions: Descriptions for "Unified RFT Core" and "First-Class Agent-Environment Interaction" have been refined for improved clarity, emphasizing general multi-step agent-environment interaction.
• Documentation Diagrams: The core architecture diagram has been updated, and a more technical diagram illustrating the data pipeline buffer has been added to provide deeper insights into the system's design.
• Workflow and Algorithm Adaptation: The sections on adapting to new scenarios and developing RL algorithms have been expanded to include examples of importing workflows from external agent frameworks and clarifying sampling strategies.
• Tutorial and Guideline Enhancements: The "Tutorials" section for multi-step agentic scenarios has been restructured and updated, and new guidelines have been added for developing data operators and understanding the coordination between explorer and trainer components.

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[gemini-code-assist]

Code Review

This pull request updates the main README file to reflect new features for versions v0.2.1 and v0.3.0. The changes include restructuring the 'News' and 'Tutorials' sections for better clarity, adding new diagrams, and updating terminology. Overall, the updates significantly improve the documentation. I have one suggestion to improve a link to an example for better user navigation.