add screenshots to PWA manifest.json

public/manifest.json

@@ -29,6 +29,43 @@
     "scope": "/",
     "display": "minimal-ui",
     "theme_color": "#3367d6",
+    "screenshots" : [
+        {
+            "src": "images/pairdrop_screenshot_mobile_1.png",
+            "sizes": "1170x2532",
+            "type": "image/png"
+        },
+        {
+            "src": "images/pairdrop_screenshot_mobile_2.png",
+            "sizes": "1170x2532",
+            "type": "image/png"
+        },
+        {
+            "src": "images/pairdrop_screenshot_mobile_3.png",
+            "sizes": "1170x2532",
+            "type": "image/png"
+        },
+        {
+            "src": "images/pairdrop_screenshot_mobile_4.png",
+            "sizes": "1170x2532",
+            "type": "image/png"
+        },
+        {
+            "src": "images/pairdrop_screenshot_mobile_5.png",
+            "sizes": "1170x2532",
+            "type": "image/png"
+        },
+        {
+            "src": "images/pairdrop_screenshot_mobile_6.png",
+            "sizes": "1170x2532",
+            "type": "image/png"
+        },
+        {
+            "src": "images/pairdrop_screenshot_mobile_7.png",
+            "sizes": "1170x2532",
+            "type": "image/png"
+        }
+    ],
     "share_target": {
         "action": "/",
         "method":"POST",