fix: create comprehensive changelog to document project changes

CHANGELOG.md

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+
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [Unreleased]
+
+- Initial creation of a comprehensive changelog.
+
+---
+
+## [2.6-Stable] - 2025-12-01
+### Added
+- Deduplication support (removes duplicate files).
+- ISO Container management.
+- Dynamic worker scaling based on CPU & memory.
+- PreCaching feature for faster file access.
+
+### Changed
+- Worker pool scaling strategies for better performance.
+- Enhanced logging with rotating logs using lumberjack.
+
+### Fixed
+- Temporary file handling issues causing "Unsupported file type" warnings.
+- MIME type checks for file extension mismatches.
+
+---
+
+## [2.5] - 2025-09-15
+### Added
+- Redis caching integration for file metadata.
+- ClamAV scanning for virus detection before finalizing uploads.
+
+### Changed
+- Extended the default chunk size for chunked uploads.
+- Updated official documentation links.
+
+### Fixed
+- Edge case with versioning causing file rename conflicts.
+
+---
+
+## [2.0] - 2025-06-01
+### Added
+- Chunked file uploads and downloads.
+- Resumable upload support with partial file retention.
+
+### Changed
+- Moved configuration management to Viper.
+- Default Prometheus metrics for tracking memory & CPU usage.
+
+### Fixed
+- Race conditions in file locking under heavy concurrency.
+
+---
+
+## [1.0] - 2025-01-01
+### Added
+- Initial release with HMAC-based authentication.
+- Basic file upload/download endpoints.
+- Logging and fundamental configuration using .toml files.