Adding Docker compose for PostgreSQL.

docker-compose.yml

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