move dockerfile location & add version

Change-Id: I0025a66a9ba77f3b86bd469e69d357faa6ad9dfc
diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..519af9a
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+6.0.0.dev