Initial web service implementation.

[ninolopy]

This PR has the implementation for a the requirements laid out in Readme.txt. It features the following:

• Docker Compose that brings up a Postgres database and a CRUDL web service.
• Automatic db schema initialization that features stored procedures and functions to block SQL injection.
• A test suite with unit tests, integration tests, and CLI tests.
• Single-command testing and dependency management with virtual environments
• input validation at all layers of the application (CLI, application, and database).
• Useful feedback and status codes for users of the CLI and API.
• Readmes for both the API and the CLI.