add changelog

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).
+
+## [Unreleased]
+
+## [0.1.1] - 2023-06-30
+
+### Changed
+
+- Fixed compilation issues on Windows.
+- Removed French accents in verbose mode prints which caused issues in certain consoles, i.e. Windows.
+- Exposed fine tune thresholds in settings.
+- Fine-tuned default settings for better numerical robustness.
+
+## [0.1.0] - 2023-06-28
+
+Initial release of PIQP!
+
+[unreleased]: https://github.com/PREDICT-EPFL/piqp/compare/v0.1.1...HEAD
+[0.1.1]: https://github.com/PREDICT-EPFL/piqp/compare/v0.1.0...v0.1.1
+[0.1.0]: https://github.com/PREDICT-EPFL/piqp/releases/tag/v0.1.0