added docker compose for dbms

.gitignore

@@ -1,3 +1,4 @@
+tmp/
 # ---> Python
 # Byte-compiled / optimized / DLL files
 __pycache__/

docker-compose.yml

@@ -0,0 +1,11 @@
+services:
+  db:
+    image: postgres
+    volumes:
+      - ./tmp/${COMPOSE_PROJECT_NAME}/db:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_DB=${POSTGRES_DB}
+      - POSTGRES_USER=${POSTGRES_USER}
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
+    ports:
+      - "${POSTGRES_PORT}:5432"