Add makefile

.gitignore

@@ -1,2 +1,3 @@
 iap_curl
 vendor
+dist

Makefile

@@ -0,0 +1,18 @@
+.DEFAULT_GOAL := help
+
+.PHONY: all
+all:
+
+.PHONY: build
+build: ## Build for local environment
+	@go build
+
+.PHONY: release
+release: ## Build for multiple OSs, packaging it and upload to GitHub Release
+	@bash <(wget -o /dev/null -qO - https://git.io/release-go)
+
+.PHONY: help
+help: ## Self-documented Makefile
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) \
+		| sort \
+		| awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'