Add changelog

CHANGELOG.md

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+# Prometheus.jl 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).
+
+<!-- ## [Unreleased] -->
+
+## [1.0.0] - 2023-11-03
+
+First stable release of Prometheus.jl:
+
+ - Supported collectors: Counter, Gauge, Summary
+ - Support for default and custom collector registries
+ - Support for metric labeling
+ - Support for exposing metrics to file and over HTTP
+ - Support for gzip compression when exposing over HTTP
+
+See [README.md](README.md) for details and documentation.
+
+
+[Unreleased]: https://github.com/fredrikekre/Literate.jl/compare/v2.15.0...HEAD
+[1.0.0]: https://github.com/fredrikekre/Literate.jl/compare/v2.8.1...v2.9.0