Add initial project setup with static files and configuration

- Create robots.txt to allow all user agents and specify sitemap location
- Add site.webmanifest for PWA support with app details
- Initialize sitemap.xml with the homepage URL and metadata
- Set up svelte.config.js for SvelteKit with static adapter and prerendering
- Configure TypeScript with tsconfig.json for strict type checking and module resolution
- Establish Vite configuration in vite.config.ts for SvelteKit integration

static/site.webmanifest

@@ -0,0 +1,15 @@
+{
+  "name": "Squiggleverse",
+  "short_name": "Squiggleverse",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#070014",
+  "theme_color": "#160030",
+  "icons": [
+    {
+      "src": "/favicon.svg",
+      "sizes": "64x64",
+      "type": "image/svg+xml"
+    }
+  ]
+}