chore: adding changelog file

CHANGELOG.md

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+# Changelog
+
+## [v2.0.1] - Minor improvements (Latest)
+
+### Feat
+- **Logging Enhancements**: Improved both debug and info log levels for better visibility, including additional context such as `clusterName` in the logs.
+- **Configuration Example**: Added a `config.yaml` example file to guide configuration setup.
+
+### Fix
+- **Race Condition**: Fixed a race condition in `TestPersistLatestProducedOffsetsMultipleClusters`, ensuring predictable order in results.
+- **Mermaid Diagram**: Corrected the broken Mermaid diagram in the architecture documentation to accurately reflect the application’s flow.
+- **E2E Test**: Updated the end-to-end tests to properly use their own configuration file (`config.yaml`), ensuring isolated and correct test runs.
+
+---
+
+## [v2.0.0] - Breaking Change: Multi-Cluster Kafka Support
+
+### Feat
+- **Multi-Cluster Support**: Introduced support for multiple Kafka clusters, changing the configuration file format to allow defining multiple Kafka clusters in an array under the `kafka_clusters` key.
+
+### Breaking Changes
+- Removed support for the previous configuration format that assumed a single Kafka cluster.
+
+---
+
+## [v1.x.x] - Initial Release
+
+### Breaking Changes
+- **Single Kafka Cluster Support**: Initial release supported only a single Kafka cluster.