basic auth working with google sign in button

nirvana-ios/Assets.xcassets/icons/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

nirvana-ios/Assets.xcassets/icons/google.imageset/Contents.json

@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "filename" : "google.svg",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

nirvana-ios/Assets.xcassets/icons/google.imageset/google.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg"  viewBox="0 0 48 48" width="48px" height="48px"><path fill="#fbc02d" d="M43.611,20.083H42V20H24v8h11.303c-1.649,4.657-6.08,8-11.303,8c-6.627,0-12-5.373-12-12	s5.373-12,12-12c3.059,0,5.842,1.154,7.961,3.039l5.657-5.657C34.046,6.053,29.268,4,24,4C12.955,4,4,12.955,4,24s8.955,20,20,20	s20-8.955,20-20C44,22.659,43.862,21.35,43.611,20.083z"/><path fill="#e53935" d="M6.306,14.691l6.571,4.819C14.655,15.108,18.961,12,24,12c3.059,0,5.842,1.154,7.961,3.039	l5.657-5.657C34.046,6.053,29.268,4,24,4C16.318,4,9.656,8.337,6.306,14.691z"/><path fill="#4caf50" d="M24,44c5.166,0,9.86-1.977,13.409-5.192l-6.19-5.238C29.211,35.091,26.715,36,24,36	c-5.202,0-9.619-3.317-11.283-7.946l-6.522,5.025C9.505,39.556,16.227,44,24,44z"/><path fill="#1565c0" d="M43.611,20.083L43.595,20L42,20H24v8h11.303c-0.792,2.237-2.231,4.166-4.087,5.571	c0.001-0.001,0.002-0.001,0.003-0.002l6.19,5.238C36.971,39.205,44,34,44,24C44,22.659,43.862,21.35,43.611,20.083z"/></svg>