Stub Makefile to call Makefile in python subdir

add `test` target that checks that the container builds

Change-Id: I37277d75e6797107b1df106ea1eb744c67897bb9
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..c13e648
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,19 @@
+# Copyright 2019 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Makefile that calls Makefile in python subdir
+
+%: python
+	$(MAKE) -C python $@
+