add CHANGELOG.md

CHANGELOG.md

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+# Change log
+
+## 2.2.4
+
+  * Rename repository from libKeyFinder to libkeyfinder
+  * Support building Windows DLL
+  * Add Windows to GitHub Actions CI
+  * Add CMake target export files
+  * Use catch2 for tests
+  * Add CTest support with standard BUILD_TESTING CMake option
+  * Add example program and build it on CI
+  * Add Doxygen documentation and deploy to https://mixxxdj.github.io/libkeyfinder/
+
+## 2.2.3
+
+  * Maintenance transferred to [Mixxx DJ Software](https://mixxx.org/) team
+  * Fix CMake build
+  * Use GitHub Actions for CI on Ubuntu and macOS
+
+## 2.2.2
+
+  * Add CMake build system support
+
+## 2.2.1
+
+  * update tests and downsampling shortcut