Add docker-compose to start steering and Postgres

docker-compose.yml

+version: '3.8'
+
+services:
+
+  django:
+    build: .
+    command: python manage.py runserver 0.0.0.0:8000
+    container_name: django
+    volumes:
+      - .:/steering
+    expose:
+      - "8000"
+    ports:
+      - "8000:8000"
+    depends_on:
+      - postgres
+    environment:
+      - DEBUG=True
+      - SECRET_KEY=foo
+      - POSTGRES_PASSWORD=aura
+
+  postgres:
+    image: postgres:13.5-bullseye
+    container_name: steering-postgres
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_USER=steering
+      - POSTGRES_PASSWORD=aura
+      - POSTGRES_DB=steering
+    expose:
+      - "5432"
+
+volumes:
+  postgres_data: