feat: complete phase 0

Makefile

@@ -0,0 +1,16 @@
+BIN := bin/heloha-server
+CMD := ./cmd/heloha-server
+
+.PHONY: build run test tidy
+
+build:
+	go build -o $(BIN) $(CMD)
+
+run:
+	go run $(CMD)
+
+test:
+	go test ./...
+
+tidy:
+	go mod tidy