Add main application structure and logging configuration

- Implement main application entry point in duck-ocr.py
- Create logging configuration in logging_config.py
- Add video streaming functionality in camera.py
- Introduce main window UI in main_window.py
- Include SVG assets for UI buttons and icons
- Update .gitignore to exclude log files
- Add placeholder .gitkeep files for empty directories

assets/close-square-svgrepo-com.svg

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?><!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
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+</svg>