basic streamlit setup with docker

[machow]

@hugobowne this PR does two main things to address #7:

• adds streamlit, along with a basic demo from part of your notebook (see app.py file).
• dockerizes the process, so it can be run using docker-compose up, and previewed from localhost:8000. I commented out some lines that will allow the dashboard to scale better when run on a beefy machine on eg Digital Ocean etc..

screencast of me running the dashboard

Notes

• it appears there is some uncertainty around how to use conda from docker. I didn't have time to shave the docker+conda yak, so used normal python + pip in the container.
• the environment.yml did not pin all dependency versions. Added the to requirements.txt.

Hope this helps!