Add 'Dockerfile'

Dockerfile

@@ -0,0 +1,12 @@
+FROM python:3.9
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install -r requirements.txt
+
+COPY app app
+
+EXPOSE 5000
+
+CMD ["flask", "run", "--host=0.0.0.0"]