Add README with feature documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

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+# Video Montage Linker
+
+A PyQt6 application to create sequenced symlinks for image files. Useful for preparing image sequences for video editing or montage creation.
+
+## Features
+
+### Multiple Source Folders
+- Add multiple source folders to merge images from different locations
+- Files are ordered by folder (first added = first in sequence), then alphabetically within each folder
+- Drag & drop folders directly onto the window to add them
+- Multi-select support for removing folders
+
+### File Management
+- Two-column view showing filename and source path
+- Drag & drop to reorder files in the sequence
+- Multi-select files (Ctrl+click, Shift+click)
+- Remove files with Delete key or "Remove Files" button
+- Refresh to rescan source folders
+
+### Symlink Creation
+- Creates numbered symlinks (`seq_0000.png`, `seq_0001.png`, etc.)
+- Uses relative paths for portability
+- Automatically cleans up old `seq_*` links before creating new ones
+
+### Session Tracking
+- SQLite database tracks all symlink sessions
+- Located at `~/.config/video-montage-linker/symlinks.db`
+- List past sessions and clean up by destination
+
+### Supported Formats
+- PNG, WEBP, JPG, JPEG
+
+## Installation
+
+Requires Python 3 and PyQt6:
+
+```bash
+pip install PyQt6
+```
+
+## Usage
+
+### GUI Mode
+
+```bash
+# Launch the graphical interface
+python symlink.py
+python symlink.py --gui
+```
+
+1. Click "Add Folder" or drag & drop folders to add source directories
+2. Reorder files by dragging them in the list
+3. Remove unwanted files (select + Delete key)
+4. Select destination folder
+5. Click "Generate Virtual Sequence"
+
+### CLI Mode
+
+```bash
+# Create symlinks from a single source
+python symlink.py --src /path/to/images --dst /path/to/dest
+
+# Merge multiple source folders
+python symlink.py --src /folder1 --src /folder2 --dst /path/to/dest
+
+# List all tracked sessions
+python symlink.py --list
+
+# Clean up symlinks and remove session record
+python symlink.py --clean /path/to/dest
+```
+
+## System Installation (Linux)
+
+To add as a system application:
+
+```bash
+# Make executable and add to PATH
+chmod +x symlink.py
+ln -s /path/to/symlink.py ~/.local/bin/video-montage-linker
+
+# Create desktop entry
+cat > ~/.local/share/applications/video-montage-linker.desktop << 'EOF'
+[Desktop Entry]
+Name=Video Montage Linker
+Comment=Create sequenced symlinks for image files
+Exec=/path/to/symlink.py
+Icon=emblem-symbolic-link
+Terminal=false
+Type=Application
+Categories=Utility;Graphics;
+EOF
+
+# Update desktop database
+update-desktop-database ~/.local/share/applications/
+```
+
+## License
+
+MIT