Add CHANGELOG.md with 5.0.0-rc

Author: greenrobot

CHANGELOG.md

@@ -0,0 +1,20 @@
+ObjectBox Generator changelog
+=============================
+
+## 5.0.0-rc (2025-11-25)
+
+C/C++
+
+* Support for external name and type annotations
+* Add new vector distance type 'Geo'
+* Bump CMake min version to 3.5 for compatibility with CMake 4.x
+
+Go
+
+* Support for external name and type annotations
+
+TypeScript/JavaScript
+
+* Releasing a preview of JavaScript code generation, which can be used with the ObjectBox TS/JS library 
+
+Older releases are available at https://github.com/objectbox/objectbox-generator/releases.