Added CHANGELOG.md

Author: worryg0d

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]
+
+### Added
+
+- S3 CircleCI job to run tests for esop-s3 (#109)
+- Changelog to track changes between releases (#110)
+
+### Fixed
+
+- INS-40014 - io.netty:netty-handler for esop-s3 was bumped to 4.1.129.Final in order to address vulnerability CVE-2025-67735 (#107)
+- INS-40333 [cassandra-image] Bump jackson.core version from 2.19.2 to 2.21.1 for esop to address vulnerability GHSA-72hv-8253-57qq (#108)
+