Added favicons, manifest,json and bunch of various size icons.

public/manifest.json

@@ -0,0 +1,34 @@
+{
+  "name": "PaperPi",
+  "short_name": "PaperPi",
+  "start_url": ".",
+  "display": "standalone",
+  "background_color": "#277dd1",
+  "description": "Raspberry Pi printer webapp",
+  "orientation": "portrait",
+  "icons": [{
+    "src": "/icon-16.png",
+    "sizes": "16x16",
+    "type": "image/png"
+  }, {
+    "src": "/icon-32.png",
+    "sizes": "32x32",
+    "type": "image/png"
+  }, {
+    "src": "/icon-64.png",
+    "sizes": "64x64",
+    "type": "image/png"
+  }, {
+    "src": "/icon-128.png",
+    "sizes": "128x128",
+    "type": "image/png"
+  }, {
+    "src": "/icon-256.png",
+    "sizes": "256x256",
+    "type": "image/png"
+  }, {
+    "src": "/icon-512.png",
+    "sizes": "512x512",
+    "type": "image/png"
+  }]
+}