add grpc server

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

grpc/Makefile

@@ -0,0 +1,19 @@
+GOPATH:=$(shell go env GOPATH)
+GOBIN:=$(shell pwd)/bin
+CGO_ENABLED=0
+VERSION="v0.0.1"
+
+DATE?=$(shell date -u "+%Y-%m-%d %H:%M:%S")
+LDFLAGS=-s -w -X 'main.AppVersion=${VERSION}' -X 'main.BuildDate=${DATE}'
+
+.PHONY: build
+build:
+	go build -ldflags "$(LDFLAGS)" -a -installsuffix cgo -o bin/app -mod=readonly *.go
+
+.PHONY: test
+test:
+	go test -v ./... -cover
+
+.PHONY: lint
+lint:
+	golangci-lint run