add handlers, storage(Postgres, sqlite) (#3)

Reviewed-on: #3
Co-authored-by: Evstigneev Denis <danteevstigneev@yandex.ru>
Co-committed-by: Evstigneev Denis <danteevstigneev@yandex.ru>

Makefile

@@ -0,0 +1,13 @@
+.PHONY: build
+build:
+	go build -o bin/app -mod=readonly ./main.go
+
+.PHONY: test
+test:
+	go test -v ./... -race -cover
+
+.PHONY: lint
+lint:
+	# Install the binary release of golangci-lint
+	# https://github.com/golangci/golangci-lint#install
+	golangci-lint run