Ignore core files

Change-Id: I7ffaceb992d12fd255fe8a608b0493c2993c18c2
Signed-off-by: Keith Burns (alagalah) <alagalah@gmail.com>
diff --git a/.gitignore b/.gitignore
index 0f59724..3f8f3c4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -100,3 +100,6 @@
 
 # vppctl command list
 /src/scripts/vppctl-cmd-list
+
+# No core files
+**/core
\ No newline at end of file