Add chrony role to manifest

Add testing Makefile for invoking DTD check

Change-Id: I527ad8987dc90d2d825a51a10d81a38b02142454
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b816daa
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,4 @@
+
+test:
+	@echo Running XMLLint on default.xml manifest
+	xmllint --noout --dtdvalid manifest.dtd default.xml