chore: add a Makefile for common tasks

Makefile

@@ -0,0 +1,15 @@
+SCENARIOS=$(shell ls bin/tests/scenarios)
+LANGUAGE=java
+SUFFIX=.java
+LOG_LEVEL=debug
+
+run_merge_on_dir:
+	cargo run -- merge --left-path=$(DIR)/left$(SUFFIX) --base-path=$(DIR)/base$(SUFFIX) --right-path=$(DIR)/right$(SUFFIX) --merge-path=$(DIR)/merge.output$(SUFFIX) --log-level=$(LOG_LEVEL) --language=$(LANGUAGE)
+
+run_diff:
+	cargo run -- diff --left-path=$(LEFT_PATH) --right-path=$(RIGHT_PATH) --language=$(LANGUAGE) --log-level=$(LOG_LEVEL)
+
+rebuild_snapshots:
+	for SCENARIO in $(SCENARIOS); do \
+		make run_merge_on_dir DIR=bin/tests/scenarios/$$SCENARIO; \
+	done