Create CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [v0.2.0] - 2026-01-04
+### Added
+- Thread-safe `Add` and `Del` methods to `Client` for dynamic host management.
+- `RWMutex` to `Client` struct to protect `devices` map.
+- `Transport` field to `Config` to allow mocking HTTP transport in tests.
+- `getDeviceByHost` helper to centralize device lookup locking.
+- Tests for thread safety and Add/Del functionality.
+
+### Changed
+- Refactored `GetAll*` methods to snapshot host keys before iteration to avoid concurrent map read/write panic.
+- Improved concurrent `GetAll` operations.
+
+## [v0.1.1] - 2026-01-04
+### Fixed
+- CI pipeline configuration.
+
+## [v0.1.0] - 2026-01-04
+### Added
+- Initial CI pipeline setup.
+- Initial release of Ubiquiti EdgeOS Go Client.