feat(pwa): added manifest.json file to the demo app

Author: AnthonyNahas

demo/src/assets/images/icons/icon-128x128.png

@@ -0,0 +1,52 @@
+{
+  "name": "@angular-material-extensions/password-strength",
+  "short_name": "material-password-strength",
+  "theme_color": "#0f9340",
+  "background_color": "#3756da",
+  "display": "browser",
+  "Scope": "/",
+  "start_url": "/",
+  "icons": [
+    {
+      "src": "images/icons/icon-72x72.png",
+      "sizes": "72x72",
+      "type": "image/png"
+    },
+    {
+      "src": "images/icons/icon-96x96.png",
+      "sizes": "96x96",
+      "type": "image/png"
+    },
+    {
+      "src": "images/icons/icon-128x128.png",
+      "sizes": "128x128",
+      "type": "image/png"
+    },
+    {
+      "src": "images/icons/icon-144x144.png",
+      "sizes": "144x144",
+      "type": "image/png"
+    },
+    {
+      "src": "images/icons/icon-152x152.png",
+      "sizes": "152x152",
+      "type": "image/png"
+    },
+    {
+      "src": "images/icons/icon-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "images/icons/icon-384x384.png",
+      "sizes": "384x384",
+      "type": "image/png"
+    },
+    {
+      "src": "images/icons/icon-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ],
+  "splash_pages": null
+}

demo/src/assets/images/icons/icon-144x144.png

@@ -37,7 +37,7 @@
   <meta name="mobile-web-app-capable" content="yes">
   <meta http-equiv="x-ua-compatible" content="ie=edge">
 
-  <link rel="icon" type="image/x-icon" href="favicon.ico">
+  <link rel="manifest" href="assets/manifest.json">
   <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
   <link href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700|Roboto+Mono:300" rel="stylesheet">