luma: adds stub Makefile.

Change-Id: I245fe79a0e4f005441c2cacddf4d7832505cf7a5
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..44d7f04
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+MAKEFLAGS += --warn-undefined-variables
+SHELL := /bin/bash
+
+.SHELLFLAGS := -eu -o pipefail -c
+.DEFAULT_GOAL := all
+.SUFFIXES:
+
+.PHONY: all
+all:
+	@true # silences watch, do not remove.
+
+.PHONY: test
+test:
+	@true