move dockerfile location & add version

Change-Id: I007fd7c7a409b69b5d62144d174ae70a5d965b5d
diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..519af9a
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+6.0.0.dev