[WAYF-72/73] add mongoose middleware + connect to MongoDB

[LocalNewsTV]

Description

This PR includes the following proposed change(s):

• Added Mongoose middleware to connect API to MongoDB - [WAYF-72]
• Updated Docker-compose to reflect API changes - [WAYF-73]
• Update Readme to reflect new keys on API Connection - [WAYF-73]

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [x] Refactoring / Documentation
• [ ] Updating Testing Framework(s)
• [ ] Version change

How Has This Been Tested?

• I ran the docker compose file and confirmed the composed API connects
• I ran the API locally and confirmed it connects

Frontend Development Changes

• [x] N/A
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to project documentation or diagrams that reflect my changes
• [ ] New and existing unit tests pass locally with my changes
• [ ] My code follows Airbnb React Style Guidelines

API Development Changes

• [ ] N/A
• [x] I have performed a self-review of my own code
• [ ] My code follows standards and practices outlined in the BC Government API Development Guidelines
• [x] New and existing unit tests pass locally with my changes
• [ ] My changes includes Swagger documentation updates that reflect the changes I am introducing