Ignore the ctags file

Signed-off-by: Deepika Bhavnani <deepika.bhavnani@arm.com>
Change-Id: I8b288cd886ee8e5483d3b4d266f986515a7ad8ce
diff --git a/.gitignore b/.gitignore
index 35afcf5..708900d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,9 @@
 .project
 .cproject
 
+# Ctags
+tags
+
 # Ignore build directory and binary files
 build/
 *.bin