Adding docker files

Author: kraigb

.dockerignore

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+node_modules
+npm-debug.log
+Dockerfile*
+docker-compose*
+.dockerignore
+.git
+.gitignore
+README.md
+LICENSE
+.vscode
+__pycache__
+env

Dockerfile

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+# Pull a pre-built alpine docker image with nginx and python3 installed
+FROM tiangolo/uwsgi-nginx-flask:python3.6-alpine3.7
+
+# Set the port on which the app runs; make both values the same.
+#
+# IMPORTANT: When deploying to Azure App Service, go to the App Service on the Azure 
+# portal, navigate to the Applications Settings blade, and create a setting named
+# WEBSITES_PORT with a value that matches the port here (the Azure default is 80).
+# You can also create a setting through the App Service Extension in VS Code.
+ENV LISTEN_PORT=5000
+EXPOSE 5000
+
+# Indicate where uwsgi.ini lives
+ENV UWSGI_INI uwsgi.ini
+
+# Tell nginx where static files live. Typically, developers place static files for
+# multiple apps in a shared folder, but for the purposes here we can use the one
+# app's folder. Note that when multiple apps share a folder, you should create subfolders
+# with the same name as the app underneath "static" so there aren't any collisions
+# when all those static files are collected together.
+ENV STATIC_URL /hello_app/static
+
+# Set the folder where uwsgi looks for the app
+WORKDIR /hello_app
+
+# Copy the app contents to the image
+COPY . /hello_app
+
+# If you have additional requirements beyond Flask (which is included in the
+# base image), generate a requirements.txt file with pip freeze and uncomment
+# the next three lines.
+#COPY requirements.txt /
+#RUN pip install --no-cache-dir -U pip
+#RUN pip install --no-cache-dir -r /requirements.txt

README.md

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 This sample contains the completed program from the tutorial, [Using Flask in Visual Studio Code](https://code.visualstudio.com/docs/python/tutorial-flask). Intermediate steps are not included.
 
-Contributions to the sample are welcome. When submitting changes, also consider submitting matching changes to the tutorial, the source file for which is [tutorial-flask.md](https://github.com/Microsoft/vscode-docs/blob/master/docs/python/tutorial-flask.md).
+It also contains Dockerfile and uwsgi.ini files necessary to build a container with a production server. The resulting image works both locally and when deployed to Azure App Service.
 
+Contributions to the sample are welcome. When submitting changes, also consider submitting matching changes to the tutorial, the source file for which is [tutorial-flask.md](https://github.com/Microsoft/vscode-docs/blob/master/docs/python/tutorial-flask.md).
 
 # Contributing
 

uwsgi.ini

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+[uwsgi]
+module = hello_app.webapp
+callable = app
+uid = 1000
+master = true
+threads = 2
+processes = 4