Add initial plugin implementation and development setup

dev/public/icons/README.md

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+# Notification Icons
+
+This directory contains icons for web push notifications.
+
+## Required Icons:
+
+- `notification-icon.png` - Main notification icon (recommended: 192x192px)
+- `notification-badge.png` - Small badge icon (recommended: 72x72px)
+- `view.png` - View action icon (recommended: 32x32px)
+- `dismiss.png` - Dismiss action icon (recommended: 32x32px)
+
+## Icon Requirements:
+
+1. **Format**: PNG with transparency support
+2. **Size**: Multiple sizes recommended (72x72, 96x96, 128x128, 192x192, 256x256, 512x512)
+3. **Design**: Simple, clear, recognizable at small sizes
+4. **Background**: Transparent or solid color that works on any background
+
+## Fallback:
+
+If custom icons are not provided, the service worker will use these default paths:
+- `/icons/notification-icon.png`
+- `/icons/notification-badge.png`
+- `/icons/view.png`
+- `/icons/dismiss.png`
+
+You can create simple colored PNG files or use emoji-based icons for testing.