Added handy recursive make for making all hardware. I promise it's not harmful

hardware/Makefile

@@ -0,0 +1,8 @@
+# Recursive Make
+SUBDIRS := $(wildcard */Makefile)
+
+all: $(SUBDIRS)
+$(SUBDIRS):
+	$(MAKE) -C $(@D)
+
+.PHONY: all $(SUBDIRS)