[doc] feat: Add agent-lightning in the list of "awesome works using verl

[wizardlancet]

Add agent-lightning into Awesome work using verl

What does this PR do?

This PR adds a recent work built upon verl into the "Awesome work using verl" Section of the README.md file.
Add agent-lightning, a flexible and extensible framework that enables seamless agent optimization for any existing agent framework, into Awesome work using verl

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[gemini-code-assist]

Code Review

This pull request adds 'Agent Lightning' to the list of 'Awesome work using verl' in the main README.md file. The change is a single-line addition to a markdown list.

The formatting is consistent with other entries in the list, the markdown syntax is correct, and the linked project is relevant.

After a thorough review of the code changes, and in accordance with the instruction to only report issues of high or critical severity, I have not found any issues to report in the provided diff. The change is a good addition to the project's documentation.