add Deskulu, opensource helpdesk and ticketing system

README.md

@@ -888,6 +888,7 @@ See https://staticsitegenerators.net and https://www.staticgen.com
   * [OTRS](http://www.otrs.com/) - Trouble ticket system for assigning tickets to incoming queries and tracking further communications.
   * [Request Tracker](https://www.bestpractical.com/rt/) - Ticket-tracking system written in Perl.
   * [TheBugGenie](http://www.thebuggenie.com) - Ticket system with extensive user rights system.
+  * [](https://github.com/Taskulu/deskulu) - Deskulu is an opensource helpdesk and ticketing system based on Drupal 7
 
 
 ## URL Shorteners