CORD-2772 set version number for vsg service

Change-Id: I9dd77b39b29675b525ca8cfe3a28a4fc0400e9ea
diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..519af9a
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+6.0.0.dev