Add robots.txt and site mantifest

public/manifest.json

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+{
+  "short_name": "Parandum",
+  "name": "Parandum",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    },
+    {
+      "src": "maskable_icon_x48.png",
+      "type": "image/png",
+      "sizes": "48x48",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "maskable_icon_x72.png",
+      "type": "image/png",
+      "sizes": "72x72",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "maskable_icon_x96.png",
+      "type": "image/png",
+      "sizes": "96x96",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "maskable_icon_x128.png",
+      "type": "image/png",
+      "sizes": "128x128",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "maskable_icon_x192.png",
+      "type": "image/png",
+      "sizes": "192x192",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "maskable_icon_x384.png",
+      "type": "image/png",
+      "sizes": "384x384",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "maskable_icon_x512.png",
+      "type": "image/png",
+      "sizes": "512x512",
+      "purpose": "any maskable"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#2a8c8c",
+  "background_color": "#111111"
+}

public/robots.txt

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+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow: