Release version 1.0.1

- Add Twig template engine integration
- Migrate all templates to Twig format
- Add German (Switzerland, Informal) translation
- Improve template organization and security
- Add Composer dependency management
- Create comprehensive changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to WooCommerce Tier and Package Prices 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).
+
+## [1.0.1] - 2025-12-21
+
+### Added
+- Twig template engine integration for all templates
+- Template loader class with WordPress integration
+- German (Switzerland, Informal) translation (de_CH_informal)
+- Composer dependency management
+- Comprehensive translation support in Twig templates
+- Template caching support (disabled in debug mode)
+
+### Changed
+- Migrated all PHP templates to Twig format (.twig)
+- Improved template organization and separation of concerns
+- Enhanced security with automatic HTML escaping in templates
+- Updated composer.json with complete package metadata
+
+### Removed
+- Old PHP template files (replaced with Twig)
+
+### Technical
+- Added Twig v3.22.2 dependency
+- Created WC_TPP_Template_Loader class for centralized template rendering
+- Integrated WordPress functions (__(), _e(), esc_*, wc_price()) into Twig
+- Added Swiss German localization with informal address form
+- Organized templates into admin/ and frontend/ directories
+
+## [1.0.0] - 2025-12-21
+
+### Added
+- Initial release
+- Tier pricing functionality (quantity-based discounts)
+- Package pricing functionality (fixed-price bundles)
+- Admin settings page for plugin configuration
+- Product meta boxes for configuring tier and package prices
+- Frontend pricing tables display
+- Cart integration for automatic price calculation
+- WooCommerce HPOS compatibility
+- Multilingual support with text domain
+- German (Germany) translation (de_DE)
+- English (US) translation (en_US)
+
+### Features
+- Volume discounts based on quantity thresholds
+- Fixed-price packages with custom labels
+- Configurable display positions (before/after cart button, after price)
+- Real-time price updates in cart
+- Responsive pricing tables
+- Admin-friendly interface for price management