* Add Dockerfile.
* Add gunicorn config files for local development.
* Add .dockerignore file.

Co-authored-by: Joseph Mulloy <jmulloy@edx.org>
Co-authored-by: Fred Smith <derf@edx.org>
Co-authored-by: Adam Blackwell <ablackwell@edx.org>
Co-authored-by: Kyle McCormick <kmccormick@edx.org>
Co-authored-by: Nadeem Shahzad <nshahzad@edx.org>