chore: prepare package for pub.dev release v0.1.0

Author: Pedroodelvalle

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).
+
+## [0.1.0] - 2025-01-14
+
+### Added
+
+- Initial release of JSON Canvas Viewer package
+- `JsonCanvasViewer` widget for rendering interactive JSON-based canvas layouts
+- Full editor application with `JsonEditorWidget` and `CanvasViewerWidget`
+- `HomePage` widget providing complete editor-viewer integration
+- Support for multiple element types:
+  - Rectangle with gradients, borders, and rounded corners
+  - Text with Google Fonts, rich text spans, and advanced styling
+  - Images with filters, blur effects, and various fit modes
+  - Circles with customizable borders
+  - Icons from Material Design icon set
+  - Gradients (linear and radial)
+  - Lines with customizable thickness
+- Interactive features:
+  - Drag and drop elements with visual feedback
+  - Resize elements with corner handles
+  - Real-time JSON synchronization between editor and canvas
+  - Debounced JSON validation
+- Advanced rendering features:
+  - Automatic scaling based on design dimensions
+  - Z-index support for element layering
+  - Rotation support for all element types
+  - Opacity control
+  - Centering and alignment options
+- Comprehensive theming with `EditorTheme` and `AppColors`
+- Platform support: Web, iOS, Android
+- Extensive documentation in `/docs` directory
+
+### Features
+
+- JSON-based declarative canvas system
+- Real-time visual editor with syntax highlighting
+- Responsive and scalable layouts
+- Google Fonts integration
+- Image filters (Paris, Vintage, Classic)
+- Touch-friendly drag interactions
+- Type-safe color parsing
+- Flexible positioning system (absolute, center, custom)
+
+[0.1.0]: https://github.com/yourusername/jsoncanvasviewer/releases/tag/v0.1.0
+

LICENSE

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+MIT License
+
+Copyright (c) 2025 Conty Team
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+