Add prepare:assets script for game asset setup (#11)

Add a Node.js script that sets up LEGO Island game assets via symlinks:
- Accepts source path interactively or via --path/-p flag
- Case-insensitive file matching for cross-platform compatibility
- Validates all required files before making changes
- Supports optional extra/ and textures/ folders
- Includes --force/-f flag to skip deletion confirmation

Updates README with new setup step and script documentation.

Author: foxtacles

README.md

@@ -23,17 +23,27 @@ A custom web frontend for the Emscripten port of [isle-portable](https://github.
 
 3. Obtain the game files (`isle.js` and `isle.wasm`) by building the Emscripten version of [isle-portable](https://github.com/isledecomp/isle-portable), then copy them to the project root.
 
-4. Start the development server:
+4. Set up the LEGO Island game assets:
+   ```bash
+   npm run prepare:assets
+   ```
+   This will prompt you for the path to your LEGO Island installation or mounted ISO and create the necessary symlinks. You can also provide the path directly:
+   ```bash
+   npm run prepare:assets -- -p /path/to/your/LEGO
+   ```
+
+5. Start the development server:
    ```bash
    npm run dev
    ```
 
-5. Open the URL shown in the terminal (usually `http://localhost:5173`).
+6. Open the URL shown in the terminal (usually `http://localhost:5173`).
 
 ## Scripts
 
 | Command | Description |
 |---------|-------------|
+| `npm run prepare:assets` | Set up LEGO Island game assets via symlinks |
 | `npm run dev` | Start development server with hot reload |
 | `npm run build` | Build for production (outputs to `dist/`) |
 | `npm run preview` | Preview the production build locally |

package.json

@@ -7,7 +7,8 @@
     "build": "vite build && cp isle.js isle.wasm dist/ && node scripts/workbox-inject.js",
     "build:ci": "vite build && node scripts/workbox-inject.js",
     "check": "svelte-check --fail-on-warnings",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "prepare:assets": "node scripts/prepare.js"
   },
   "devDependencies": {
     "@sveltejs/vite-plugin-svelte": "^4.0.0",