Dockerize

[natalefalco]

New features

• add dockerfile
• add minimal readme for usage

Reviewer checklist

• [x] The code functionally does what it supposed to do (implements the feature or fixes the bug).
• [x] The code quality meets the standards.
• [x] Tests are added to check the feature or avoid regression to a bug.
• [x] The documentation is updated (both Postman, wiki and docstrings) if applicable.
• [x] The logging if up to date.

references horvathmarton/stock-buddy-api#31