adding note about IBM JDK

After I spent a whole afternoon trying to make IBM JDK to work under IDEA, I decided to add a note on the doc so other would have a chance to have it working faster than I did.

docs/hacking-guide/en/ide.md

@@ -20,6 +20,18 @@ Once the project has been imported and IDEA has caught up importing all the rele
 run JUnit tests from with the IDE.  Select any test class in the tests -> integration tests folder.  Right click on the
 class in the project tab and click "Run <classname>".  If the "Run <classname>" option is present then you're all set to go.
 
+### Note about IBM JDK on Idea
+
+If you are running IBM JDK it may be a little tricky to get it working.
+
+After you add the JDK to the IDE, add also the vm.jar specific to your platform under that jdk.
+
+```
+(e.g: JAVA_HOME/jre/lib/amd64/default/jclSC180/vm.jar
+```
+
+There's a [SOF Question](http://stackoverflow.com/questions/27906481/can-intellij-14-be-used-to-work-with-ibm-jdk-1-7/32852361#32852361) about this that could be useful in case you are running into this issue.
+
 ### Style Templates for Idea
 
 We have shared the style templates that are good for this project. If you want to apply them use these steps: