feat: Add screenshots to manifest.json (#3369)

* feat: Add screenshots to manifest.json

* rename screenshots

public/manifest.json

         }
       ]
     }
-  }
+  },
+  "screenshots": [
+    {
+      "src": "/screenshots/virtual-whiteboard.png",
+      "type": "image/png",
+      "sizes": "462x945"
+    },
+    {
+      "src": "/screenshots/wireframe.png",
+      "type": "image/png",
+      "sizes": "462x945"
+    },
+    {
+      "src": "/screenshots/illustration.png",
+      "type": "image/png",
+      "sizes": "462x945"
+    },
+    {
+      "src": "/screenshots/shapes.png",
+      "type": "image/png",
+      "sizes": "462x945"
+    },
+    {
+      "src": "/screenshots/collaboration.png",
+      "type": "image/png",
+      "sizes": "462x945"
+    },
+    {
+      "src": "/screenshots/export.png",
+      "type": "image/png",
+      "sizes": "462x945"
+    }
+  ]
 }