add service ti check if running on client

Author: MacKentoch

src/app/services/universal/index.js

@@ -0,0 +1,13 @@
+// @flow
+
+
+ /**
+  * Check if currently running in the browser or not
+  * -> useful for server side rendering
+  *
+  * @returns {boolean}
+  */
+export function isBrowserSide(): boolean {
+  return typeof window === 'object';
+}
+