added favicon

public/favicon.svg

@@ -0,0 +1,17 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" role="img" aria-label="pdftools favicon" width="64" height="64"><metadata><rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/"><rdf:Description><dc:creator>RealFaviconGenerator</dc:creator><dc:source>https://realfavicongenerator.net</dc:source></rdf:Description></rdf:RDF></metadata><defs>
+    <linearGradient id="pdf-bg" x1="10" y1="4" x2="54" y2="60" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#ff4b3f"></stop>
+      <stop offset="1" stop-color="#c91424"></stop>
+    </linearGradient>
+    <filter id="soft-shadow" x="-20%" y="-20%" width="140%" height="140%">
+      <feDropShadow dx="0" dy="2" stdDeviation="1.25" flood-color="#7a0b12" flood-opacity="0.28"></feDropShadow>
+    </filter>
+  </defs><rect width="64" height="64" rx="14" fill="url(#pdf-bg)"></rect><g filter="url(#soft-shadow)">
+    <path d="M19 11h22l9 9v31a4 4 0 0 1-4 4H19a4 4 0 0 1-4-4V15a4 4 0 0 1 4-4z" fill="#fff"></path>
+    <path d="M41 11v9h9z" fill="#ffd9d6"></path>
+    <path d="M23 24h19" stroke="#d41627" stroke-width="4" stroke-linecap="round"></path>
+    <path d="M23 34h14" stroke="#d41627" stroke-width="4" stroke-linecap="round" opacity="0.82"></path>
+    <path d="M23 44h19" stroke="#d41627" stroke-width="4" stroke-linecap="round" opacity="0.64"></path>
+  </g><style>@media (prefers-color-scheme: light) { :root { filter: none; } }
+@media (prefers-color-scheme: dark) { :root { filter: none; } }
+</style></svg>

public/site.webmanifest

@@ -0,0 +1,21 @@
+{
+  "name": "PDFTools",
+  "short_name": "PDFTools",
+  "icons": [
+    {
+      "src": "/web-app-manifest-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "maskable"
+    },
+    {
+      "src": "/web-app-manifest-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ],
+  "theme_color": "#ffffff",
+  "background_color": "#ffffff",
+  "display": "standalone"
+}