Add readme for sdg tutorial

Signed-off-by: Ao Tang <[email protected]>

Author: suiyoubi

tutorials/synthetic/README.md

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+# Synthetic Data Generation Tutorials
+
+Hands-on tutorials for generating synthetic data with NeMo Curator. Complete working examples with detailed explanations.
+
+## Quick Start
+
+
+## Available Tutorials
+
+| Tutorial | Description | Files |
+|----------|-------------|-------|
+| **[Multilingual Q&A Generation](synthetic_data_generation_example.py)** | Generate synthetic Q&A pairs in multiple languages using LLMs | `synthetic_data_generation_example.py` |
+