Git ignore .DS_Store

Change-Id: I2af7d6e773f6440f7e0d3d7eef839a94acefdc92
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

.gitignore

diff --git a/.gitignore b/.gitignore
index 207b48d..05e704f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 .pydevproject
 *.html
 *.pdf
+.DS_Store