Add changelog for v0.1.1-memory release

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).
+
+## [v0.1.1-memory] - 2025-05-03
+### Added
+- SQLite adapter implementation in storage/adapters/sqlite_adapter.py
+- Audit logging system in security/memory/audit.py
+- Performance benchmarks in tests/performance/benchmarks.py
+
+### Changed
+- Updated memory subsystem documentation
+- Improved error handling in storage interface
+
+### Fixed
+- Minor security fixes in audit logging
+- Performance optimizations in SQLite operations