Add Makefile at the root

This Makefile is just to launch Sharness tests for now.

Makefile

@@ -0,0 +1,23 @@
+all: help
+
+test: test_expensive
+
+test_short: test_sharness_short
+
+test_expensive: test_sharness_expensive
+
+test_sharness_short:
+	$(MAKE) -j1 -C test/sharness/
+
+test_sharness_expensive:
+	TEST_EXPENSIVE=1 $(MAKE) -j1 -C test/sharness/
+
+help:
+	@echo 'TESTING TARGETS:'
+	@echo ''
+	@echo '  test                    - Run expensive tests'
+	@echo '  test_short              - Run short tests and sharness tests'
+	@echo '  test_expensive          - Run a few extras'
+	@echo '  test_sharness_short'
+	@echo '  test_sharness_expensive'
+	@echo ''