adding demo and picture frame scripts

[geekinsanemx]

adding two new scripts

demo.py just script to test screen functionalities
picture_frame.py convert the screen into a picture frame that slideshows pictures "smartly"

Turing Smart Screen Image Slideshow

Description:
This script displays an automated slideshow of images on a Turing Smart Screen display.
It supports both portrait and landscape images, automatically resizing and formatting them
to fit the display. Portrait images are displayed in pairs side-by-side.

Features:
- Automatic image rotation at configurable intervals
- Support for multiple display hardware revisions (A, B, C, D, SIMU)
- Time and date overlay on displayed images
- Recursive directory searching for images
- Automatic creation of default image if none found

Configuration:
1. Command Line Arguments:
   --debug       : Enable debug output (more verbose logging)
   --images PATH : Specify directory containing images (default: './images')
   --recursive   : Search for images recursively in subdirectories

2. Hardcoded Configuration (modify in code):
   - COM_PORT: Serial port for display ("AUTO" for auto-detection)
   - REVISION: Display hardware revision (A, B, C, D, or SIMU)
   - IMAGE_ROTATION_INTERVAL: Seconds between image changes (default: 30)
   - WIDTH, HEIGHT: Display dimensions in portrait mode (default: 320x480)

Usage:
1. Place images in the 'images' directory (or specify custom path with --images)
2. Run script: python3 picture_frame.py [options]
3. Press Ctrl+C to exit gracefully

Image Requirements:
- Supported formats: PNG, JPG/JPEG, BMP, GIF
- Any orientation (portrait or landscape)
- Will be automatically resized and formatted for display

Notes:
- To run picture_frame.py from any PATH environment folder (copied this script to run globally),
  must copy library/ folder to /home/${USER}/.local/lib/python<version>/site-packages/
- script creates a '.images' directory automatically for processed versions of source images.
- First run may be slow as it processes all images.