Add IntelliJ project files to .gitignore

Change-Id: Iaf98ae264d17a70ec4662428c987badfdb026b10
Issue-ID: INT-510
Signed-off-by: Maciej Wejs <maciej.wejs@nokia.com>
diff --git a/.gitignore b/.gitignore
index 209db72..4126c2c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,3 +22,6 @@
 .DS_Store
 devtool/
 seccom/
+.idea
+*.iml
+