See the blog post covering the main steps.
To be hosted on Heroku (files Procfile, requirements.txt and runtime.txt).
To run locally,
python app.py
The model is from another repo on my github and is in the model directory. The flask app is defined in app.py which contains generic logic. The model-specific logic for the API is in the serve.py file.
An example of client is in the client directory.