add postgres

postgres/README.md

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+postgres
+========
+
+![](https://www.postgresql.org/media/img/docs/hdr_logo.png)
+
+## docker-compose.yml
+
+```yaml
+postgres:
+  image: postgres:alpine
+  ports:
+    - "5432:5432"
+  environment:
+    - POSTGRES_USER=root
+    - POSTGRES_PASSWORD=root
+    - POSTGRES_DB=postgres
+  restart: always
+```
+
+## up and running
+
+```bash
+$ docker-compose up -d
+
+$ docker-compose exec postgres psql postgres
+>>> SELECT CURRENT_TIMESTAMP;
+              now
+-------------------------------
+ 2016-12-07 01:44:29.872928+00
+(1 row)
+
+>>> \q
+```

postgres/docker-compose.yml

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+postgres:
+  image: postgres:alpine
+  ports:
+    - "5432:5432"
+  volumes:
+    - ./data:/var/lib/postgresql/data
+  environment:
+    - POSTGRES_USER=root
+    - POSTGRES_PASSWORD=root
+    - POSTGRES_DB=postgres
+  restart: always