docs(changelog): add CHANGELOG.md

CHANGELOG.md

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+# 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).
+
+<!-- next-header -->
+
+## [0.3.0] - 2024-04-22
+### Added
+- `BlazeMap` collection
+- Key-type generating macros:
+  - `define_key_wrapper!`
+  - `define_key_wrapper_bounded!`
+  - `define_plain_id!`
+
+<!-- next-url -->
+[0.3.0]: https://github.com/andrewsonin/blazeamp/releases/tag/v0.3.0