ONOS-3182 Starting on path visualization app.

Change-Id: Id9b074afb22599473b1849acc380fa189061e8bb
diff --git a/apps/pathpainter/src/main/resources/app/view/ppTopov/ppTopov.css b/apps/pathpainter/src/main/resources/app/view/ppTopov/ppTopov.css
new file mode 100644
index 0000000..cbf460f
--- /dev/null
+++ b/apps/pathpainter/src/main/resources/app/view/ppTopov/ppTopov.css
@@ -0,0 +1,2 @@
+/* css for sample app topology overlay  */
+