Add Support for iOS "Add to Homescreen"

* Adds basic Manifest.json
 * Adds Meta Tags for iOS
 * Adds Meta Tags for Android
 * Adds Logo for Manifest.json
 * Adds iOS Logo for homescreen

static/manifest.json

@@ -0,0 +1,15 @@
+{
+    "name": "Libreddit",
+    "short_name": "Libreddit",
+    "display": "standalone",
+    "background_color": "#2A3443",
+    "description": "An alternative private front-end to Reddit",
+    "theme_color": "#2A3443",
+    "icons": [
+      {
+        "src": "./logo.png",
+        "sizes": "512x512",
+        "type": "image/png"
+      }
+    ]
+  }