Add Cosmo to user showcase

Author: knolleary

index.html

@@ -121,6 +121,7 @@ <h4>In the cloud</h4>
         <div class="content">
             <h3>Who's using Node-RED?</h3>
             <ul id="user-list">
+                <li><a href="https://www.cosmonautasoftware.com/en-us/cosmo-psim-software-platform"/><img src="users/cosmo.png"/></a></li>
                 <li><a href="https://www.42flows.tech"/><img src="users/42flows.jpeg"/></a></li>
                 <li><a href="https://www.broadsens.com/wireless-gateway/"><img src="users/broadsens.png"/></a></li>
                 <li><a href="http://chatbots.studio/"><img src="users/chatbots-studio.png"/></a></li>