add ctags and cscope files to .gitignore

Change-Id: I047cc41a5d0c4a6e4191ca35c505ff21236abcfa
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/.gitignore b/.gitignore
index fad4680..b2e2c62 100644
--- a/.gitignore
+++ b/.gitignore
@@ -49,3 +49,7 @@
 .DS_Store
 .idea/
 .project
+
+# cscope and ctags
+/cscope.*
+/tags