move dockerfile location & add version

Change-Id: I43d64e6d35a4718ab6e9958953acecf0e0c7a027
diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..519af9a
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+6.0.0.dev