add Makefile with build/install targets

Makefile

@@ -0,0 +1,27 @@
+PREFIX  ?= /usr/local
+BINDIR  ?= $(PREFIX)/bin
+BINARY  := barnard
+
+GO      ?= go
+GOFLAGS ?=
+
+.PHONY: build install uninstall clean fmt vet
+
+build:
+	$(GO) build $(GOFLAGS) -o $(BINARY) .
+
+install: build
+	install -d $(DESTDIR)$(BINDIR)
+	install -m 755 $(BINARY) $(DESTDIR)$(BINDIR)/$(BINARY)
+
+uninstall:
+	rm -f $(DESTDIR)$(BINDIR)/$(BINARY)
+
+clean:
+	rm -f $(BINARY)
+
+fmt:
+	$(GO) fmt ./...
+
+vet:
+	$(GO) vet ./...