Add docker-compose support

Dockerfile

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+FROM alpine:3
+

README.md

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+# Shopping
+
+
+## Run
+
+```bash
+docker-compose up
+```

docker-compose.yml

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+version: "3.2"
+
+services:
+
+  db:
+    image: postgres:9.6
+    environment:
+      POSTGRES_PASSWORD: shopping
+      POSTGRES_DB: shopping
+    ports:
+      - 5432:5432
+  app:
+    image: golang
+    depends_on:
+      - db
+    volumes:
+      - .:/go/src/toozhao.com/shopping
+    working_dir: /go/src/toozhao.com/shopping
+    command: ["go", "run", "main.go"]
+    ports:
+      - 8080:8080
+    environment:
+      DB_HOST: db
+      DB_USER: postgres
+      DB_PASSWORD: shopping
+      DB_DATABASE: shopping