Added TeamWarden App to website showcase

Summary:My update is to the app showcase on the react native website, adding my TeamWarden iOS and Android app (in alphabetical order)
Closes facebook#6163

Differential Revision: D2994724

fb-gh-sync-id: c739f347c704ced139b871d52d84f0b6acc5a17c
shipit-source-id: c739f347c704ced139b871d52d84f0b6acc5a17c

Author: ng-marcus

website/src/react-native/showcase.js

@@ -548,6 +548,13 @@ var apps = [
     link: 'https://itunes.apple.com/us/app/thai-tone/id1064086189?mt=8',
     author: 'Alexey Ledak',
   },
+  {
+    name: 'TeamWarden',
+    icon: 'http://a1.mzstatic.com/eu/r30/Purple69/v4/09/37/61/0937613a-46e3-3278-5457-5de49a4ee9ab/icon175x175.png',
+    linkAppStore: 'https://itunes.apple.com/gb/app/teamwarden/id1052570507?mt=8',
+    linkPlayStore: 'https://play.google.com/store/apps/details?id=com.teamwarden',
+    author: 'nittygritty.net',
+  },
   {
     name: 'Text Blast',
     icon: 'http://a3.mzstatic.com/us/r30/Purple49/v4/4f/29/58/4f2958a1-7f35-9260-6340-c67ac29d7740/icon175x175.png',