add Progressive Web App

app/views/pwa/manifest.json.erb

@@ -0,0 +1,25 @@
+{
+  "name": "<%= Docuseal.product_name %>",
+  "short_name": "<%= Docuseal.product_name %>",
+  "id": "/",
+  "icons": [
+    {
+      "src": "/logo.svg",
+      "type": "image/svg+xml",
+      "sizes": "any"
+    },
+    {
+      "src": "/apple-touch-icon.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    }
+  ],
+  "start_url": "/",
+  "display": "standalone",
+  "scope": "/",
+  "orientation": "natural",
+  "description": "<%= Docuseal.product_name %> is an open source platform that provides secure and efficient digital document signing and processing.",
+  "categories": ["productivity", "utilities"],
+  "theme_color": "#FAF7F4",
+  "background_color": "#FAF7F4"
+}