Alternately, you can use this tool to generate one:
http://tools.trepmal.com/wp-readme-generator/

A readme.txt is needed so your plugin will display correctly in our repository, but also so we can make sure you're providing the users with all the information they need before they install your plugin. Our goal with this is to make sure everyone knows what they're installing and what they need to do before they install it. No surprises :)

This is especially important if your plugin is making calls back to your own servers. For the most part, we do not permit offloading of images or code, however in the case where you are providing a service (like Disqus or Akismet or Twitter), we permit it. The catch is you have to actually explain this to the layman in your readme, so they know where data is going.

Please send a link so the completed plugin can be downloaded. Alternately you can reply to this and send a .zip or .rar file.

The readme says this:

License: GPLv2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html

but your included license.txt says it's GPLv3.

Also you have calls to localhost:
<script src="localhost/shopnew/wp-content/plugins/arty-popup/uploader.js" type="text/javascript"></script>

This should be changed to use wp_enqueue_scripts() instead.

Please correct this to be one or the other and email us back with a link to your corrected code.