Add changelog, uniform naming, prepare v0.2.0 tagging (#18)

Reviewed-on: moritz/ptouch-prnt#18

CHANGELOG.md

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+# Changelog
+
+All notable changes to ptprnt 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).
+
+## [0.2.0] - v0.2.0
+
+### Added
+- Multi-label support - print multiple labels in sequence
+- LabelBuilder API with fluent interface for constructing labels
+- FakePrinter driver for testing without hardware (outputs PNG files)
+- PrinterService core service for printer operations
+- CliParser component with ICliParser interface
+- ICairoWrapper interface for testable graphics rendering
+- MockCairoWrapper for unit testing
+- Pre-commit hook for automatic copyright updates
+- USB trace mode for debugging (`-Dusb_trace_only=true`)
+
+### Changed
+- **Major refactoring**: Reorganized codebase into layered architecture
+  - Application layer: PtouchPrint, CliParser, PrinterService
+  - Printer drivers: Moved to `src/printers/` with factory pattern
+  - Graphics system: Added builder pattern and Cairo abstraction
+  - Core services: Separated into `src/core/` directory
+- Label class now uses dependency injection for Cairo/Pango
+- CLI parsing separated from main application logic
+- Updated dependencies to latest versions
+- Improved project documentation (README.md, CLAUDE.md)
+
+### Fixed
+- Label corruption issues resolved
+- Printer info retrieval bugs
+- USB attachment logic
+- Multiple lines handling in labels
+- Printer selection logic
+
+## [0.1.0] - 2024
+
+### Added
+- Initial release of ptprnt
+- Basic label printing functionality for Brother P-touch P700 series
+- Pango/Cairo-based text rendering
+- USB device communication via libusb-1.0
+- Template-based Bitmap class supporting multiple pixel formats (ALPHA8, RGBX8, RGBA8, ARGB8)
+- Monochrome bitmap conversion for printer output
+- PrinterDriverFactory for creating printer instances
+- USB device abstraction layer (IUsbDevice, UsbDevice, UsbDeviceFactory)
+- Command-line interface using CLI11
+- Logging with spdlog and file output
+- Unit tests using GoogleTest
+- Code coverage reporting with gcovr
+- Meson build system with C++20 support
+- CI/CD pipeline with automated testing
+
+### Core Components (v0.1.0)
+- PtouchPrint: Main application orchestrator
+- P700Printer: Brother P-touch P700 driver implementation
+- Bitmap: Template-based image storage
+- Label: Text rendering with Pango/Cairo
+- Monochrome: Bitmap to monochrome conversion
+- UsbDevice: libusb wrapper for device communication
+
+---
+
+## Project Origins
+
+ptprnt is a modern C++20 rewrite of [ptouch-print](https://git.familie-radermacher.ch/linux/ptouch-print.git).
+All credits for reverse engineering the Brother P-touch USB protocol go to Dominic Rademacher.