Adding WIP note.

Author: mithro

README.md

@@ -1,3 +1,12 @@
+
+SymbiFlow WIP changes for Verilog to Routing (VTR)
+==================================================
+
+This branch contains work in progress changes for using Verilog to Routing
+(VTR) as part of SymbiFlow.
+
+---
+
 # Verilog to Routing (VTR)
 [![Build Status](https://travis-ci.org/verilog-to-routing/vtr-verilog-to-routing.svg?branch=master)](https://travis-ci.org/verilog-to-routing/vtr-verilog-to-routing) [![Documentation Status](https://readthedocs.org/projects/vtr/badge/?version=latest)](http://docs.verilogtorouting.org/en/latest/?badge=latest)