doc: Added Changelog

CHANGELOG.md

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+<!--
+SPDX-FileCopyrightText: 2024 Strichting Health-RI
+
+SPDX-License-Identifier: CC-BY-4.0
+-->
+
+# 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).
+
+## [Unreleased]
+
+### Added
+
+## [v1.2.2] - 2024-06-28
+
+### Added
+- feat(ci): integrate SonarCloud analysis and coverage report closes #18
+- fix: Security alert requests closes #30
+- doc: Improved Readme.md