Merge pull request #3794 from tgxworld/add_web_manifes

FEATURE: Add web manifest for Chrome users.

spec/controllers/manifest_json_controller_spec.rb

@@ -0,0 +1,12 @@
+require 'spec_helper'
+
+RSpec.describe ManifestJsonController do
+  context 'index' do
+    it 'returns the right output' do
+      title = 'MyApp'
+      SiteSetting.title = title
+      get :index
+      expect(response.body).to include(title)
+    end
+  end
+end