(Actually) Add Changelog for v1.0.0

Author: andysnell

CHANGELOG.md

@@ -0,0 +1,49 @@
+# 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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.1] - 2025-07-30
+
+### Added
+
+- This changelog.
+
+[1.0.0]: https://github.com/phoneburner/api-handler/releases/tag/v1.0.1
+
+## [1.0.0] - 2025-07-30
+
+### Added
+
+- Initial stable release of the API Handler library
+- Support for PHP 8.4 alongside 8.2 and 8.3
+- CRUD operations through dedicated handlers:
+    - CreateHandler for resource creation
+    - ReadHandler for resource retrieval
+    - UpdateHandler for resource modification
+    - DeleteHandler for resource removal
+- Response transformation capabilities with TransformableResponse
+- PSR-7 and PSR-15 compliance for HTTP message interfaces and server request handlers
+- Middleware support through DispatchMiddleware
+- Flexible response factories
+
+### Changed
+
+- Updated for Tortilla 2 compatibility with static returns
+- Modified response handling to return mutated instances instead of the same instance
+- Using the develop branch for HTTP Tortilla dependency
+
+### Fixed
+
+- Allow null return for all hydrator calls
+- Fixed PHPStan return annotations to properly handle null values
+- Resolved static analysis issues with PHPStan
+- Addressed code quality issues with Rector
+
+### Security
+
+- Initial security review completed for v1.0.0 release
+
+[1.0.0]: https://github.com/phoneburner/api-handler/releases/tag/v1.0.0