Add CHANGELOG

Author: tizoc

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).
+
+## [Unreleased]
+
+## [0.0.1] - 2023-12-22
+
+First public release.
+
+### Added
+
+- Alpha version of the node which can connect and syncup to the berkeleynet network, and keep applying new blocks to maintain consensus state and ledger up to date.
+- Web-based frontend for the node.
+
+[unreleased]: https://github.com/openmina/openmina/compare/v0.0.1...develop
+[0.0.1]: https://github.com/openmina/openmina/releases/tag/v0.0.1