Adds instructions for using generators

Author: typhonius

.data/README.md

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+# Data Generators Setup
+
+## Quick Setup
+
+For any generator directory (aml, cpg, diligence, gtm, healthcare, supplychain, telco):
+
+```bash
+cd .data/<demo>
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements.txt
+python generate.py
+```

.data/cpg/requirements.txt

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+# CPG generator uses only built-in Python modules
+# No external dependencies required

.data/healthcare/requirements.txt

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+faker>=18.9.0

.data/supplychain/requirements.txt

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+faker>=18.9.0