Add CHANGELOG.md for v0.1.0-alpha

Author: d-oit

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project 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).
+
+## [0.1.0-alpha] - 2025-10-06
+
+### Added
+- Initial alpha release of Code Guardian, a comprehensive code scanning and analysis tool.
+- **CLI Crate**: Command-line interface with handlers for scanning, reporting, benchmarking, and advanced operations.
+- **Core Crate**: Core scanning engine featuring:
+  - Built-in detectors for common code issues.
+  - Support for custom detectors via JSON configuration.
+  - Distributed scanning for large codebases.
+  - Incremental scanning to optimize performance.
+  - Enhanced configuration options.
+  - Performance monitoring and optimizations.
+- **Output Crate**: Multiple output formatters including CSV, HTML, JSON, Markdown, and plain text.
+- **Storage Crate**: Database-backed storage with initial schema migrations for persistent data management.
+- Comprehensive documentation including tutorials for getting started, advanced usage, automation, and custom detectors.
+- Example configurations and detector files to help users get started.
+- CI/CD workflows for continuous integration, documentation generation, and automated releases.
+- Agent-based development system for collaborative and automated code management.
+- Benchmarks and performance tests to ensure optimal scanning speed.
+- Test suites across crates for reliability and code quality.