add multi platform targets to makefile

Makefile

@@ -1,2 +1,40 @@
-go-build:
+program = q3rcon-proxy
-	go build ./cmd/q3rcon-proxy/
+
+GO = @go
+BIN_DIR := bin
+
+WINDOWS=$(BIN_DIR)/$(program)_windows_amd64.exe
+LINUX=$(BIN_DIR)/$(program)_linux_amd64
+VERSION=$(shell git describe --tags --always --long --dirty)
+
+.DEFAULT_GOAL := build
+
+.PHONY: fmt vet build windows linux test clean
+fmt:        
+	$(GO) fmt ./...
+
+vet: fmt        
+	$(GO) vet ./...
+
+build: vet windows linux | $(BIN_DIR)
+	@echo version: $(VERSION)
+
+windows: $(WINDOWS)
+
+linux: $(LINUX)
+
+
+$(WINDOWS):
+	env GOOS=windows GOARCH=amd64 go build -v -o $(WINDOWS) -ldflags="-s -w -X main.version=$(VERSION)"  ./cmd/q3rcon-proxy/
+
+$(LINUX):
+	env GOOS=linux GOARCH=amd64 go build -v -o $(LINUX) -ldflags="-s -w -X main.version=$(VERSION)"  ./cmd/q3rcon-proxy/
+
+test:
+	$(GO) test ./...
+
+$(BIN_DIR):
+	@mkdir -p $@
+
+clean:
+	@rm -rv $(BIN_DIR)