Add CHANGELOG

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

Author: gearnode

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2026-02-01
+
+Initial release of the kit library.
+
+### Added
+
+- **log**: Structured logging wrapper around `slog` with OpenTelemetry trace correlation
+- **pg**: PostgreSQL client with connection pooling, transactions, advisory locks, and observability
+- **migrator**: File-based SQL migration runner with version tracking
+- **httpserver**: HTTP server with tracing, metrics, and response rendering helpers
+- **httpclient**: HTTP client with pooled/non-pooled transports and telemetry
+- **worker**: Generic worker pool with backpressure and graceful shutdown
+- **unit**: Application lifecycle management with config loading, metrics server, and trace exporter
+
+[0.1.0]: https://github.com/gearnode/kit/releases/tag/v0.1.0