:Adds CHANGELOG

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).
+
+## [Unreleased]
+
+### Added
+- Adds CHANGELOG.
+
+### Changed
+
+
+## [0.7.0] - 2023-06-29
+
+### Changed
+- Disable pipeline runs for forks. [#25](https://github.com/microsoft/kiota-serialization-text-php/pull/25)
+- Update writeObjectValue parameters to match abstractions change. [#26](https://github.com/microsoft/kiota-serialization-text-php/pull/26)
+
+## [0.6.0] - 2023-05-18
+
+### Changed
+- Fix static analysis issues. [#14](https://github.com/microsoft/kiota-serialization-text-php/pull/14)
+- Bump abstractions. [#20](https://github.com/microsoft/kiota-serialization-text-php/pull/20)
+
+## [0.5.0] - 2023-05-18
+
+### Added
+- Composed types (De)Serialization support. [#7](https://github.com/microsoft/kiota-serialization-text-php/pull/7)
+- Adds dependabot auto-merge and conflicts workflows. [#9](https://github.com/microsoft/kiota-serialization-text-php/pull/9)
+- Add coverage reporting SonarCloud. [#10](https://github.com/microsoft/kiota-serialization-text-php/pull/10)
+- Bump abstractions. [#11](https://github.com/microsoft/kiota-serialization-text-php/pull/11)
+
+### Changed
+- Change workflow to use strategy matrix for PHP versions. [#8](https://github.com/microsoft/kiota-serialization-text-php/pull/8)
+
+## [0.4.0] - 2023-05-18
+
+### Changed
+- Bump abstractions. [#5](https://github.com/microsoft/kiota-serialization-text-php/pull/5)
+
+
+*For previous releases, please see our [Release Notes](https://github.com/microsoft/kiota-serialization-text-php/releases)*