virtio tools: add .gitignore

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/tools/virtio/.gitignore b/tools/virtio/.gitignore
new file mode 100644
index 0000000..1cfbb01
--- /dev/null
+++ b/tools/virtio/.gitignore
@@ -0,0 +1,3 @@
+*.d
+virtio_test
+vringh_test