Add lab_4 Config files stub

Author: endofcake

lab_4/docker-compose.yml

@@ -0,0 +1,8 @@
+version: '3'
+services:
+  postgres:
+    image: postgres:9.6.1
+    ports:
+      - "5432:5432"
+    volumes:
+    - ./data:/var/lib/postgresql/data