add new icons to demo app

Author: ethanshar

demo/src/assets/icons/close.png

@@ -1,6 +1,9 @@
 import {Assets, Typography, Spacings} from 'react-native-ui-lib'; // eslint-disable-line
 
 Assets.loadAssetsGroup('icons.demo', {
+  close: require('./assets/icons/close.png'),
+  dashboard: require('./assets/icons/dashboard.png'),
+  image: require('./assets/icons/image.png'),
   refresh: require('./assets/icons/refresh.png'),
   search: require('./assets/icons/search.png')
 });