Added makefile

GNUmakefile

@@ -0,0 +1,20 @@
+SHELL:=bash
+
+.PHONY: build
+build: ## make build  # Builds a cartridge
+	zig build
+
+.PHONY: help
+help:
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'
+
+.PHONY: init
+init: ## make init  # initialize project dependencies
+	npm install wasm4
+	rm package.json package-lock.json  # w4 will think it is an AssemblyScript game if we leave these files
+
+.PHONY: serve
+serve: ## make serve  # run a nodejs web server
+	node_modules/.bin/w4 watch --no-open --no-qr
+
+.DEFAULT_GOAL := help