CHANGELOG.md: added

[ci skip]

.github/workflows/build.yml

@@ -65,7 +65,8 @@ jobs:
             
             ---
             
-            TODO FULL CHANGELOG
+            ### Full Changelog
+            See [CHANGELOG.md](https://github.com/cryptomator/cryptomator/blob/develop/CHANGELOG.md).
             
             📜 List of closed issues is available [here](TODO)
             

CHANGELOG.md

@@ -0,0 +1,16 @@
+# 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 1.19.0.
+Changes to prior versions can be found on the [Github release page](https://github.com/cryptomator/cryptomator/releases).
+
+## [Unreleased](https://github.com/cryptomator/cryptomator/compare/1.18.0...HEAD)
+
+### Added
+* New Self-Update Mechanism (initially for .dmg and Flatpak packages) (#3948)
+
+### Changed
+* Built using JDK 25 (#4031)