[Database] Created database service and docker config

[kylestang]

Description

Creates the postgres service hosted with docker. Default user is martletplace and port is 8310. Password is set with the POSTGRES_PASSWORD env variable.

Closes #13

How to Test

docker compose up --build

psql -p 8310 -U martletplace -h localhost

Checklist

• [x] The code includes tests if relevant
• [x] I have actually self-reviewed my changes and done QA