add a basic makefile

Included commands:

- deps: install glide and dependencies
- install: install lnd
- fmt: run `go fmt` excluding vendor
- test: run `go test` as per documentation

Makefile

@@ -0,0 +1,20 @@
+.PHONY: all glidebin glide deps install fmt test
+
+all: install
+
+glidebin:
+	go get -u github.com/Masterminds/glide
+
+glide: glidebin
+	glide install
+
+deps: glide
+
+install: deps
+	go install . ./cmd/...
+
+fmt:
+	go fmt ./... $$(go list ./... | grep -v '/vendor/')
+
+test:
+	go test -v -p 1 $$(go list ./... | grep -v '/vendor/')