change location of docker file & add version file

Change-Id: If22f97e269b2efc5b89bf23011d5ccda03547be9
diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..519af9a
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+6.0.0.dev