Add very basic Makefile to run all tests

Run all write.C and read.C macros in sequence, no support for
parallelism yet.

Author: hahnjo

Makefile

@@ -0,0 +1,21 @@
+ROOT_EXE := $(shell which root.exe)
+ifeq ($(ROOT_EXE),)
+$(error Could not find root.exe)
+endif
+
+.PHONY: all
+all:
+	$(MAKE) write
+	$(MAKE) read
+
+# This assumes there is no whitespace in any of the paths...
+WRITE_C := $(sort $(shell find . -name write.C))
+READ_C := $(sort $(shell find . -name read.C))
+
+.PHONY: write
+write:
+	@$(foreach c,$(WRITE_C),$(ROOT_EXE) -q -l $(c) &&) true
+
+.PHONY: read
+read:
+	@$(foreach c,$(READ_C),$(ROOT_EXE) -q -l $(c) &&) true