Add Makefile to ease maintenance

Makefile

@@ -0,0 +1,31 @@
+################
+# Public tasks #
+################
+
+# This is the default task
+all: help
+
+setup: ## Setup local environment
+	asdf plugin add nodejs   || true
+	asdf plugin add yarn     || true
+	asdf install
+	asdf current
+
+deps: ## Install dependencies
+	yarn install
+
+build: ## Build JS
+	yarn run gulp
+
+
+.PHONY: all setup deps build
+
+
+#################
+# Private tasks #
+#################
+
+help:
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
+
+.PHONY: help