Add CHANGELOG.md

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 2.10.0.
+Changes to prior versions can be found on the [Github release page](https://github.com/cryptomator/cryptofs/releases).
+
+## [Unreleased](https://github.com/cryptomator/cryptofs/compare/2.9.0...HEAD)
+
+### Added
+* [changelog](CHANGELOG.md) file
+
+### Changed
+* Use JDK 25 for build (bf26d6c9cd15a2489126ee0409a8ec9eca59da0c)
+* Pin external ci actions (#320)
+
+### Fixed
+* Replacing internal path class `CryptoPath` with strings in `FilesystemEvent`s (#319)
+* Make DOS file attribute class immutable (#305)