Rearrange app directory structure

client/source/scripts/constants/ClientConstants.js

@@ -0,0 +1,9 @@
+import keyMirror from 'keymirror';
+
+const ClientConstants = keyMirror({
+  ADD_TORRENT: 'client--add-torrent',
+  REMOVE_TORRENT: 'client--remove-torrent',
+  CLIENT_STATS_CHANGE: 'client--stats-change'
+});
+
+export default ClientConstants;