Actor: Adding CHANGELOG.md

Signed-off-by: Václav Vančura <commit@vancura.dev>

.actor/CHANGELOG.md

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+# Changelog
+
+All notable changes to the Docling Actor will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2025-02-07
+
+### Added
+
+- Initial release of Docling Actor
+- Support for multiple document formats (PDF, DOCX, images)
+- OCR capabilities for scanned documents
+- Multiple output formats (md, json, html, text, doctags)
+- Comprehensive error handling and logging
+- Dataset records with processing status
+- Memory monitoring and resource optimization
+- Security features including non-root user execution
+
+### Technical Details
+
+- Actor Specification v1
+- Docling v2.17.0
+- Python 3.11
+- Node.js 20.x
+- Comprehensive error codes:
+  - 10: Invalid input
+  - 11: URL inaccessible
+  - 12: Docling processing failed
+  - 13: Output file missing
+  - 14: Storage operation failed
+  - 15: OCR processing failed