Add .idea folder to gitignore

 The folder created by PyCharm automatically. Would be usefull for
 PyCharm users.

Change-Id: I80b8a7389ec95ec53aa4f7aadff0922c5ef3a30c
Related-Bug: PROD-25130 (PROD:25130)
diff --git a/.gitignore b/.gitignore
index aa8e42a..9d5880e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 *.swp
 *.pyc
 .ropeproject
+.idea