add docker support

Dockerfile

@@ -0,0 +1,9 @@
+FROM python:2.7-slim
+
+WORKDIR /app
+
+COPY . .
+
+RUN pip install beautifulsoup4 lxml
+
+CMD ["python", "ppf.py"]

docker-compose.yml

@@ -0,0 +1,11 @@
+version: '3.8'
+
+services:
+  ppf:
+    build: .
+    volumes:
+      - .:/app
+    working_dir: /app
+    command: python ppf.py
+    environment:
+      - PYTHONUNBUFFERED=1