Added a template for a CHANGELOG.

Author: HansMartinA

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/1.1.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+
+[Unreleased]: https://github.com/PalladioSimulator/Palladio-Supporting-EclipseJavaDevelopmentTools/compare/releases/5.1.0...HEAD
+[5.1.0]: https://github.com/PalladioSimulator/Palladio-Supporting-EclipseJavaDevelopmentTools/compare/8bc07...releases/5.1.0
+[development after 1.4.0]: https://github.com/PalladioSimulator/Palladio-Supporting-EclipseJavaDevelopmentTools/compare/e46b0...8bc07
+[1.4.0]: https://github.com/PalladioSimulator/Palladio-Supporting-EclipseJavaDevelopmentTools/commit/e46b0003803a8ccda7c3aa380ff2c759937d1ccb