fix: add missing requirements.txt for federated-llm example

[31groot]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
federated-llm example had no requirements.txt, causing contributors
to hit ModuleNotFoundError with no guidance. Added dependencies based
on actual imports in model.py, FedAvg-PEFT.py, and FedAvgM-PEFT.py.

Dependencies added: torch, transformers, peft, tqdm, numpy, evaluate.

Which issue(s) this PR fixes:
Fixes #563

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[gemini-code-assist]

Code Review

This pull request introduces a requirements.txt file for the federated LLM example, specifying core dependencies such as torch, transformers, peft, and evaluate. The feedback highlights a missing dependency, rouge_score, which is required by the evaluate library's ROUGE metric and should be added to prevent runtime import errors.

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[gemini-code-assist]

The evaluate library's ROUGE metric (used in model.py via load_metric("rouge")) requires the rouge_score package to be installed. Without it, running the evaluation will fail with an ImportError. Please add rouge_score to the requirements.

evaluate>=0.4.0
rouge_score>=0.1.2

[31groot]

/assign @jaypume