chore: add repo meta files (LICENSE, README, CHANGELOG, gitignore)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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).
+
+## [Unreleased]
+
+### Added
+- Initial project scaffold with Material 3 Expressive theme
+- Adaptive launcher icon (numeral "1" on slate squircle, referencing *kalendae*)
+- German + English localization infrastructure
+- Hilt + DataStore dependency injection and preferences setup
+- Gitea CI/CD workflows for build, test, lint, and release