Update CHANGELOG.md

Author: malortie

CHANGELOG.md

@@ -7,4 +7,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-<changes>
+## [1.0.0] - 2025-07-28
+
+### Added
+
+- Initial release
+
+### Fixed
+
+- Glitchy advanced video options dialog
+- Missing scoreboard strings
+
+### Changed
+
+- Remove OSX conditions in optionssubmouse.res
+- Remove OSX conditions in optionssubvideoadvanceddlg.res