Add CHANGELOG to track version history and changes

Author: kholdrex

CHANGELOG.md

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+# Changelog
+
+This file tracks the major changes in each release.
+
+## [Unreleased]
+
+### Added
+- Support for OpenAI and local AI providers
+- SQL safety checks with table allowlists and EXPLAIN analysis
+- Automatic policy enforcement for row-level security
+- Query performance monitoring and caching
+- CI setup for multiple Ruby and Rails versions
+
+### Changed
+- Simplified the SQL linter to work better with different database adapters
+- Improved the query compiler with better Arel integration
+- Cleaner error messages and logging
+
+## [0.1.0] - 2024-08-10
+
+### Added
+- Basic gem structure and setup
+- Core Query class with SQL generation and safety checks
+- Simple query validation using dry-schema
+- Local query planning and compilation
+- MIT license and initial docs