docs: add CHANGELOG.md

Signed-off-by: kwanhur <[email protected]>

CHANGELOG.md

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+  ~ Copyright 2022 kwanhur
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+  ~ Licensed under the Apache License, Version 2.0 (the "License");
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+<!--
+This changelog should always be read on `master` branch. Its contents on other branches
+does not necessarily reflect the changes.
+-->
+
+# 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).
+
+## [v1.0.0] - 2022-03-19
+
+### Added
+
+- ipvsctl sub-commands `service`, `server`, `timeout`, `zero`
+- Documents README.md
+
+### Fixed
+
+- functions' annotation