docs: add CHANGELOG.md for initial release

- Document all features for v0.1.0
- Follow Keep a Changelog format
- Include comprehensive feature list
- Add requirements section

Author: koriym

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] - 2025-07-07
+
+### Added
+- Initial release of Ray.InputQuery
+- Core `InputQuery` class for transforming flat HTTP data into structured PHP objects
+- `#[Input]` attribute for marking query-sourced parameters
+- `#[InputFile]` attribute for file upload handling
+- Automatic prefix-based nesting (e.g., `assigneeId`, `assigneeName` → `UserInput` object)
+- Type-safe scalar conversion leveraging PHP's type system
+- Full dependency injection integration with Ray.Di
+- Support for arrays and ArrayObject collections
+- Optional file upload functionality with `FileUploadFactory`
+- `NullUploadFactory` for projects without file upload requirements
+- Comprehensive documentation and examples
+- 100% test coverage
+- Framework integration guide for Laravel, Symfony, CakePHP, Yii, BEAR.Sunday, and Slim
+- Demo applications including CSV processing and file upload examples
+
+### Features
+- **Declarative Input Handling**: Use attributes to define input structure
+- **Automatic Type Conversion**: Converts string inputs to appropriate PHP types
+- **Nested Object Support**: Automatically creates nested objects from flat data
+- **DI Integration**: Seamlessly integrates with dependency injection containers
+- **File Upload Support**: Optional integration with koriym/file-upload package
+- **Framework Agnostic**: Works with any PHP framework or standalone
+
+### Requirements
+- PHP 8.1 or higher
+- ray/di ^2.18
+- symfony/polyfill-php83 ^1.28
+- koriym/file-upload ^0.2.0 (optional, for file upload support)
+
+[0.1.0]: https://github.com/ray-di/Ray.InputQuery/releases/tag/0.1.0