Add CHANGELOG.md for v0.1.0

Author: Carlos Bolanos

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] - 2025-10-03
+
+### Added
+- Initial release of query-builder
+- Type-safe column matchers for Int, String, and Date columns
+- Logical grouping with AND/OR conditions
+- String matching with Exact, Contains, StartsWith, EndsWith options
+- Case-sensitive and case-insensitive string matching
+- Date range comparisons (Exact, After, Before, Between)
+- Sorting functionality with ASC/DESC support
+- Pagination with Limit and Offset
+- Column name validation for security
+- Parameterized query support
+- Comprehensive test suite with 89.1% code coverage
+- 30 unit tests and 15 integration tests
+
+[0.1.0]: https://github.com/bolanosdev/query-builder/releases/tag/v0.1.0