chore(build): add Makefile

Makefile

@@ -0,0 +1,32 @@
+## Makefile
+
+.PHONY: help setup lint fmt test build release docs clean
+
+help: ## Show this help.
+	@grep -E '^[a-zA-Z_-]+:.*?## ' $(MAKEFILE_LIST) | \
+		sed 's/\t/    /g' | \
+		awk 'BEGIN {FS = ":.*?## "}; { printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2 }'
+
+setup: ## Install project dependencies.
+	npm install
+
+lint: ## Run ESLint.
+	npm run lint
+
+fmt: ## Run Prettier.
+	npm run format
+
+test: ## Run tests.
+	npm test
+
+build: ## Build project.
+	npm run build
+
+release: ## Bump version and publish.
+	npm run release
+
+docs: ## No build step for docs; Markdown files in docs/.
+	@echo "No docs to build; see docs/"
+
+clean: ## Remove build artifacts.
+	rm -rf dist coverage