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/pause-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 -->
+<svg width="800px" height="800px" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M2 6C2 4.11438 2 3.17157 2.58579 2.58579C3.17157 2 4.11438 2 6 2C7.88562 2 8.82843 2 9.41421 2.58579C10 3.17157 10 4.11438 10 6V18C10 19.8856 10 20.8284 9.41421 21.4142C8.82843 22 7.88562 22 6 22C4.11438 22 3.17157 22 2.58579 21.4142C2 20.8284 2 19.8856 2 18V6Z" stroke="white" stroke-width="3"/>
+<path d="M14 6C14 4.11438 14 3.17157 14.5858 2.58579C15.1716 2 16.1144 2 18 2C19.8856 2 20.8284 2 21.4142 2.58579C22 3.17157 22 4.11438 22 6V18C22 19.8856 22 20.8284 21.4142 21.4142C20.8284 22 19.8856 22 18 22C16.1144 22 15.1716 22 14.5858 21.4142C14 20.8284 14 19.8856 14 18V6Z" stroke="white" stroke-width="3"/>
+</svg>