docs: add echoserver CHANGELOG.md

testing/v8serialize-echo/CHANGELOG.md

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+# Changelog
+
+All notable changes to v8serialize/echoserver will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to
+[Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+Nothing yet.
+
+## [0.3.0] - 2024-09-24
+
+### Added
+
+- Container healthcheck — The container image now includes a HEALTHCHECK that
+  passes when the server is listening.
+  ([#4](https://github.com/h4l/v8serialize/pull/4))
+
+## [0.2.0] - 2024-09-24
+
+### Added
+
+- Server introspection — `GET /` reports supported serialization features and
+  software version numbers of the running server.
+
+## [0.1.0] - 2024-08-28
+
+- The first stable release.
+
+[unreleased]:
+  https://github.com/h4l/v8serialize/compare/echoserver-v0.3.0...HEAD
+[0.3.0]: https://github.com/h4l/v8serialize/releases/tag/echoserver-v0.3.0
+[0.2.0]: https://github.com/h4l/v8serialize/releases/tag/echoserver-v0.2.0
+[0.1.0]: https://github.com/h4l/v8serialize/releases/tag/echoserver-v0.1.0