Add official JB badge

Author: valich

README.md

@@ -2,4 +2,5 @@
 # ruby-debug-ide
 An interface which glues ruby-debug to IDEs like Eclipse (RDT), NetBeans and RubyMine.
 
+[![official JetBrains project](http://jb.gg/badges/official.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)
 [![Gem Version](https://badge.fury.io/rb/ruby-debug-ide.svg)][gem]