Create README.md

tests/README.md

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+# Timeline Feature Test Suite
+
+## Overview
+
+Test suite for the Before/After Timeline feature in ARF.
+
+## Test Files
+
+- `test_timeline_calculator.py` - Unit tests for calculation logic
+- `test_timeline_formatter.py` - Unit tests for formatting
+- `test_timeline_integration.py` - Integration tests
+- `conftest.py` - Shared fixtures
+
+## Running Tests
+
+### Run all tests
+```bash
+pytest tests/