CORD-2772 set version number for addressmanager service

Change-Id: I60ba25ab682eb5b42b4d317dc00395b9e79be628
diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..519af9a
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+6.0.0.dev