add postgres

postgres/README.md

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+# Setup Postgres server on Docker
+
+1. Start docker
+
+```
+$ docker-composer up -d
+```
+
+4. Stop server
+```
+$ docker-compose down
+```

postgres/docker-compose.yml

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+# Use postgres/example user/password credentials
+version: '3.1'
+
+services:
+
+  db:
+    image: postgres
+    restart: always
+    ports:
+      - 5432:5432
+    environment:
+      POSTGRES_PASSWORD: example
+
+  adminer:
+    image: adminer
+    restart: always
+    ports:
+      - 8082:8080
+