Create CHANGELOG.md

Author: Woody4618

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).
+
+## [0.2.0] - 2025-02-05
+
+### Changed
+- Updated CI/CD pipeline with reusable workflow configurations
+- Enhanced build and test automation
+- Now using solana actions version 0.2.0
+- Updated readme 
+