manytrace: introduce changelog

Author: dshulyak

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Fixed
+- Spawn a separate thread for timer interrupt to fix starvation issues ([189c785](https://github.com/category-labs/manytrace/commit/189c785))
+
+## [0.1.1] - 2025-07-11
+
+### Added
+- Initial release with core functionality