Update README.md

Author: rpuig

README.md

@@ -3,8 +3,11 @@ This example shows how to display a set of images inside a folder ramdonly , eac
 To test it you need to clone this repo.
 
 Create img/ directory in the root folder
+fill the directory with any number of images in jpg format 
 
 Install npm 
 
 Install express.js
 
+run the server.js with "node server.js" command
+