Add a CHANGELOG

CHANGELOG.md

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+[//]: # (Copyright 2023 Rodolphe Bréard <rodolphe@breard.tf>)
+
+[//]: # (Copying and distribution of this file, with or without modification,)
+[//]: # (are permitted in any medium without royalty provided the copyright)
+[//]: # (notice and this notice are preserved.  This file is offered as-is,)
+[//]: # (without any warranty.)
+
+# 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).
+
+
+## [Unreleased]
+
+### Added
+- The "About" page
+- French translation
+
+### Changed
+- Account deletions has been moved to a dedicated page
+- Error handling has been improved
+- All Bulma components are included
+
+### Fixed
+- The QR code scanner now works with strict CSP
+
+
+## [0.1.0] - 2023-08-01
+
+### Added
+
+- Initial application with a limited set of functionalities.