Add CHANGELOG

Author: infeo

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/).
+
+The changelog starts with version 1.7.0.
+Changes to prior versions can be found on the [Github release page](https://github.com/cryptomator/integrations-api/releases).
+
+## [Unreleased]
+
+### Changed
+
+* **[BREAKING]** Updated required build JDK to 21 (a88fa29d9cc05a0e39ab15420517d0f25cff6f35)