Create CHANGELOG.md

.gitattributes

@@ -6,6 +6,7 @@
 /.gitignore             export-ignore
 /.github                export-ignore
 /LICENSE                export-ignore
+/CHANGELOG.md           export-ignore
 /README.md              export-ignore
 /README-zh_CN.md        export-ignore
 /project.godot          export-ignore

CHANGELOG.md

@@ -0,0 +1,15 @@
+# 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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+### Added
+- Extra options menu: Save As, Copy, and Paste.
+
+## [1.0.0] - 2022-02-25
+### Added
+- Initial release.
+
+[1.0.0]: https://github.com/timothyqiu/gdfxr/releases/tag/1.0

README-zh_CN.md

@@ -30,3 +30,7 @@
 如果你希望使用原始的 sfxr 保存出的文件，请确保使用 `.sfxr` 扩展名保存。你也可以在原始的 sfxr 中加载并编辑 `.sfxr` 文件。
 
 **注意：** 由于 GDScript 的性能限制，生成较长的音效时编辑器可能会有短暂的停滞。只有编辑器会受此影响。在游戏中使用 `.sfxr` 文件是不会在运行时生成任何东西的。
+
+## 更新日志
+
+见 [CHANGELOG](CHANGELOG.md)。

README.md

@@ -42,3 +42,7 @@ If you want to reuse an existing sound from the original sfxr, make sure to save
 **Note:** Due to performance constraints with GDScript, the editor may freeze a bit when generating
 long sounds. This only happens in-editor.
 Using `.sfxr` files in-game won't generate anything at runtime.
+
+## Changelog
+
+See [CHANGELOG](CHANGELOG.md).